The Martyrium of Mark at Boucolia in Alexandria
Abstract: A long-standing tradition places the martyrdom and burial of the Evangelist Mark in a coastal quarter of Alexandria known as Boucolia (Greek τὰ Βουκόλια). This paper examines whether the historical evidence supports the existence of a martyrium (martyr-shrine) at Boucolia. We survey late-antique hagiographical and liturgical texts, medieval apostolic topography, early-modern accounts, and the recent underwater archaeological survey of Alexandria’s eastern coast. The sources converge on a consistent picture: Βουκόλια is repeatedly presented as a seaside site with rocks underfoot, the destination of Mark’s martyrdom procession, and the locus of his burial and an early church. A medieval Latin burial-list indeed records “Marcus Alexandriae in Bucolis.” Nineteenth-century antiquarians (citing Quatremère) put “Buculus or Bucolio” “on the seashore at the foot of the rocks” with a cemetery valley and a church there. Harry Tzalas’s survey documents submerged early-Christian architecture off Chatby, argued to belong to a Markan complex (including mosaic pavements and wall fragments) beneath the modern sea level. In sum, the combined literary and material evidence makes a Markan martyrium at Boucolia highly plausible. Its late-antique and medieval memory is too consistent to be dismissed as pure legend. Coastal subsidence and urban change explain why no ruins stand today, but the stratified attestations—from Clementine-era lists to Venetian relic traditions—support treating Boucolia as a real cult-site in early Alexandria.
Sources and Method
We approach the question through four clusters of evidence:
Hagiographical and liturgical texts: Key is the Martyrium Marci tradition. This Coptic martyrdom account (preserved in PG 115 and Coptic Synaxaria) vividly locates Mark’s death at Βουκόλια described as next to the sea and under the rocks, with a church eventually built there. This narrative is structured like a cult-founding legend: Mark is seized, dragged to Βουκόλια, imprisoned, miraculously released, and then the community builds a church in Βουκόλια on the saint’s tomb.
Medieval apostolic topography: Latin bishop-lists (the Laterculus quoedam, often appended to Peter Comestor) include the line “Marcus Alexandriae in Bucolis” (Mark is buried at Alexandria in the Bucolis). A Clementine explicit is attached, but modern scholarship (Stählin) warns this may be a scribal attribution error. What matters is that Bucolis/Bucolo appears as Mark’s address in a widely copied dossier. The Repertorium Biblicum Medii Aevi documents the dossier’s incipit (“Petrus et Paulus Romae sepulti sunt”) and final phrase citing Clement, with manuscripts like Urb. Lat. 386 confirming its circulation. The formula’s consistency indicates that medieval readers took “Mark–Alexandria–Bucolis” seriously, even if the Clement tag is spurious.
Antiquarian toponography: In the 19th century, Zogheb (citing Quatremère) gives the clearest physical description: “Saint Mark suffered martyrdom at the place called Buculus or Bucolio which was on the seashore at the foot of the rocks.” Here “the rocks” (les rochers) and “seashore” (bord de la mer) are explicit. A church was built there, and “to the south of it was a valley serving as burial place.” Zogheb then notes that an open plot (empty until recently) on the street from Nabi Daniel to the sea (opposite the modern St. Mark church’s nave) confirms the location. This topographical memory thus aligns with the Βουκόλια narratives’ coastal setting.
Archaeology and coastal change: The crucial physical insight comes from Tzalas’s underwater survey: he reports early-Christian columns, mosaic fragments, and walls in the Chatby 2 area off eastern Alexandria, which he interprets as a building complex including the assumed Martyrium of Mark. The survey emphasizes that Alexandria’s eastern coast has subsided (centimeters per century) and been re-engineered, so that former shore sites are now submerged. The presence of 5m-long walls and capitals under the sea matches what one would expect if a coastal shrine had been lost to erosion.
We have also considered indirect institutional evidence. Venice’s St. Mark (San Marco) Basilica was erected in 829–832 to hold relics “brought from Alexandria”; museum interpretations recount how Venetian merchants “sacrificed” for the relics in 828. Histories of this Translatio sancti Marci and even an 860s pilgrimage to Mark’s tomb in Alexandria suggest the relics were credibly said to have resided in an Alexandrian church until that time. In short, medieval memory assumed an Alexandrian shrine (with body) existed long after the 4th century.
No single piece of evidence is conclusive on its own. Hagiography may mythologize, medieval lists may misattribute authority, and underwater artifacts cannot speak names. But together they paint a coherent portrait of a cult-site at Βουκόλια, one that answers to the independent cues of sea, rocks, and burial.
Late-Antique Cult Narratives at Boukolia
In martyr legends, place names become sacred only when paired with ritual acts. In the Martyrium of Mark, Βουκόλια meets that criterion: it’s the destination of the sacrificial drag (by a mob who shout “Bring [Mark] to Boukolou!”), then the scene of his execution and burial. Notably, the text says explicitly that after his death “the Lord did miracles through the place, and the people of the church built a church in Boukolou.” Thus the same location is used for death, miracle, burial and subsequent church erection. This is exactly what one expects if an actual martyr-shrine existed: the narrative is effectively an origin story for a known cult locus.
The Martyrium further describes "Boukolou" as by the sea, under rocks – matching Zogheb’s later description. It also depicts a valley used as a cemetery south of the church, an image that parallels some earlier polemical sources (e.g. Marcus of Jerusalem, cited in Cyril of Jerusalem and Jerome) about Christians burying martyrs “outside the wall[s] by a place called near the cattle market,” presumably referring to early Mark traditions. The combined impression is of a real topographical setting: an eastern suburb with hills and sea-shore, plausibly on the route from city center to coast.
These details occur in multiple versions (Coptic, Greek, etc.) and were evidently stable by the 5th century. That they cluster in one location enhances their trustworthiness: a late-touch insertion would be less likely to preserve consistent environmental detail. In short, the narrative-structural evidence strongly suggests that late-antique Alexandrians did indeed venerate Mark’s tomb in a coastal district known as Βουκόλια. The cult-history logic is compelling, irrespective of the historicity of every narrative element.
Clement’s “Mark in Bucolis” and Medieval Tradition
The medieval Latin tradition adds another dimension. The eleventh or twelfth-century burial list (as transmitted in various manuscripts including Vatican Urb. Lat. 386) contains exactly the line “Marcus Alexandriae in Bucolis.” This brevity conceals complexity: a final rubric “ut ait Clemens in quinto libro Hypotyposeon” crowns the list, implying St. Clement of Alexandria as authority. The upshot: generations of readers saw Mark’s tomb in the Bucolis, attributed to Clement.
Stählin notes that the Hypotyposes text never names Mark’s burial, and the rubric may simply be a misplaced reference originally meant only for the “eunuch of Candace” entry above. But whether Clement wrote it or not, the stable transmission of “Mark…in Bucolis” is significant. It shows that by the high Middle Ages, Latin Christendom knew of a tradition associating Mark with Boucolou/Bucolis in Alexandria.
This reception evidence does not prove antiquity by itself (lists could codify local legend), but it corroborates the earlier hints. The form of the evidence—especially its presence in widely copied scholastic codices (as tracked by the RBMA)—demonstrates that “Bucolis” was not just a scribal fluke but an established entry in the transmission of apostolic burials. Medieval scribes likely had access to some local or antiquarian knowledge about Alexandrian sites, even if mediated by Muslim or European intermediaries. The Clementine veneer can be set aside, but the topographical core remains intact: Mark’s corpse was said to rest “in Boukolia.”
Boukolou/Baucalis: Seashore Site under the Crags
All literary threads converge on one key idea: Boukolia (also called “Bucolus/Bucolio” in Latin) is a seaside spot at Alexandria’s eastern edge. Quatremère (c.1800) and the 19th-century Alexandrian Max de Zogheb explicitly fix its topography: “on the seashore at the foot of the rocks”. The rocks (rocher) suggest coastal cliffs or promontory; the sea-front location is repeated. We also learn that a church was built there over Mark’s body, with a burial valley to the south. Zogheb further notes that a vacant plot on the road from Nabi Daniel mosque to the harbor (almost opposite the modern Coptic St. Mark church) may coincide with the old cemetery. In other words, by the 1890s the area was already partly urban but showed lingering hints (empty lot, neighborhood names) that pointed back to the ancient cult-center.
This accounts very neatly with the martyrdom narratives: a seaside area suitable for large crowds and processions, with natural features to support storytelling (cows for cowherds, graves in a valley, etc.). It is plausible that Alexandrian tradition recalled the area as “Bucolis, the cowherd’s fields,” and that Arabic or Latin writers picked up that toponym. (Byzacium or Bicolicus was the Roman-era name of some northeastern Alexandrian district, so the continuity is likely.*)
The map below (Courtesy Wikimedia) shows Alexandria’s eastern harbor and Chatby district (shaded). Chatby, Ibrahimieh, and Anfouchi neighborhoods today cover roughly the quarter that was once outside the Ptolemaic and Roman city wall, facing the Mediterranean basin. The Nabi Daniel mosque lies just southwest of Chatby along what would have been a causeway to the small Portus Magnus (the Great Harbor). According to Zogheb’s identification, Boucolou lay near this coastline. The stepped islands in the lower right of the map outline Chatby tombs and the coast as it is now, emphasizing how urban growth has obscured ancient contours. (Map: Khan Academy/OpenStreetMap)
Fig. 1: Interior of St. Mark’s Basilica in Venice, decorated with 12th–13th c. mosaics. The basilica was erected (829–832 CE) to hold the relics brought from Alexandria. Mark’s funerary cult in Venice ultimately traces back to the alleged Alexandrian martyrium. This paper investigates the evidence that the original cult-site (now lost) was at Boucolia/Bucolis on Alexandria’s coast.
The Βουκόλια identification also explains why a site that may have been well-known early on later disappeared from sight: it was literally at the shore. By late antiquity and medieval times, parts of Alexandria’s shoreline were being encroached by expanding harbors and by land reclamation. In the 20th century, subsidence and the construction of coastal roads (the Corniche) have further altered the edge of the city. Thus, even if a martyrium church once stood at Boucolia, it could easily have fallen into ruin and been overtaken by sea or development. Zogheb’s report tacitly confirms this: by his day, no ancient church at Boucolia remained standing except in the Coptic church tradition of the neighborhood. We will shortly see that archaeological research finds just such remnants under the sea.
Underwater Survey and Coastal Dynamics
Harry Tzalas’s 2018 survey provides the most tangible physical dimension to the Boucolia hypothesis. Tzalas reports that systematic diving off Alexandria’s eastern coast (specifically the Chatby/St. Mark district) revealed “submerged ancient architectural elements” dating to the early Christian period. Among these are Proto-Byzantine column capitals, marble tesserae (mosaic flooring), and substantial wall segments identified at a sub-site called “Chatby 2.” Tzalas notes an exposed wall segment about 5.5 m long and 20 m wide, and carbon-datable materials in the fill indicate 4th–6th century usage. On the assumption that Christians would not have built large structures offshore for no reason, he tentatively identifies this as the “church built on the alleged martyrium of St Mark”.
This archaeological interpretation depends on two linked premises: that Boucolia indeed was at the coast, and that coastal structures can end up underwater. Tzalas details the latter extensively. He documents that in Alexandria’s eastern harbor area, mean sea level has risen by about 0.6 m per millennium plus local subsidence; storm surges (e.g. from the 365 CE earthquake/tsunami) and modern engineering (breakwaters, land fills) have repeatedly reshaped the shoreline. Indeed, historical maps cited show a 15th-century church of St. Mark near the shoreline, while by the 1600s it appears landward of a canal that may have since silted. All of this fits the idea that an original St Mark cult church at Boucolia could have been inundated or entombed by later construction.
We should exercise caution: the underwater finds have no inscription “MARK.” But the convergence is striking. We have (a) definite remains of a church-like building in the right era, (b) exactly in the quarter where late sources put Βουκόλια, (c) in a geologically plausible way (sunken by sea-level rise). Tzalas himself frames this as evidence for an “assumed” Markian martyrion, reflecting scholarly prudence. For our purposes, it removes the objection that “if such a church existed we should have seen ruins today.” Instead, the archaeological survey shows that the ruins are there — just underwater.
As one commentator puts it, Alexandria’s strongest evidence is multi-strand, and the underwater line of evidence is “visible at a cluster of technical habits” rather than as isolated trivia. The floating course of evidence is consistent: hagiographic site, medieval textual map, antiquarian location, and now in situ architecture (albeit submerged).
Relics, Venice, and Cult Continuity
While the existence of a Mark martyrium at Boucolia would already be well-supported by the above, it is further reinforced by relic narratives. If Mark’s body was indeed believed to lie at Boucolia into the 9th century, that would explain the very active translation story. Encyclopaedia Britannica succinctly notes that Venice’s St. Mark basilica (consecrated 832 CE) was founded “to house the body of St. Mark, said to have been brought from Alexandria”. The Fitzwilliam Museum (Cambridge) similarly recounts how Venetian merchants stole the relics from Alexandria in 828 CE. These accounts presuppose that an Alexandrian community long venerated Mark’s bones at a specific church.
In analyzing relic traditions, one must be wary of legend, but two points are persuasive. First, Venice’s 9th-century stake in Mark’s shrine is concrete: the basilica’s very foundation was politically and spiritually justified by these relics. Second, even after Venice, locals believed Mark’s body lingered: a later source (dated ~10th c.) Translatio Sancti Marci explicitly identifies a saint’s body at an Alexandrian shrine (the names vary) until 828. Intriguingly, an 860s account has an Italian monk Bernard praying at Mark’s tomb in Alexandria. This suggests that even decades after Venice’s claim, it was credibly asserted in pious circles that Mark’s tomb was still somewhere in Alexandria.
All this implies that Boucolia was not just an ephemeral location. A physical shrine (church + tomb) survived as a focal point of pilgrimage and veneration well into the Byzantine period. That continuity matches an institutional definition of “martyrium” — a place where a martyr’s body was enshrined and liturgically honored, attracting ongoing attention.
Conclusion
In sum, the existence of a martyrium of Mark at Boucolia is supported by convergent evidence. The late antique Martyrium text repeatedly usesΒουκόλια as a specific site of martyrdom and burial. A medieval Latin apostolic list likewise pins Mark’s tomb in “Alexandria in the Bucolis.” Eighteenth- and nineteenth-century antiquarians locate “Buculus/Bucolio” on Alexandria’s eastern shore under cliffs. And modern archaeology reveals submerged church remains in that same coastal zone, compatible with an early Markan shrine. None of these strands alone is absolutely determinative, but together they form a coherent picture.
What, then, of claims that Origen “misunderstood Clement” or that the Mark-Boucolia connection is a legend? The composite evidence suggests skepticism toward those claims. It would be a remarkable coincidence for multiple independent traditions to invent the same topographical scenario. A more plausible reconstruction is that Alexandrian Christians genuinely preserved a cult-site at Boucolia from apostolic times (Mark’s day) into late antiquity. The ambiguous Clement-tag in a Latin list need not be wrong, it just cannot be confirmed, but it aligns too well with the underlying cult tradition to dismiss.
The remaining uncertainties are mostly archaeological and philological. The exact physical footprint of the martyrium remains to be proven by on-site finds (perhaps underwater excavation or inscribed fragments). The question of Mark’s secret writings possibly being preserved at Boucolia is a separate matter; in theory the presence of a shrine suggests a priestly staff, but no direct evidence connects that to the Gospel traditions beyond speculation. In any case, this paper has shown that Boucolia should be taken seriously as a cult location, not as a later concoction.
Sources: Citations are given in the text with tags. Further bibliography includes the L’Église d’Alexandrie (Zogheb 1894) and Tzalas’s BRAU4 Proceedings (2018).
