Simon Cleophas qui et Judas, post Jacobum episc. CXX annorum crucifixus est in Jerusalem, Traiano mandante.
Clement of Rome is universally regarded as a first century figure. This information coupled with the archaic "Peter and Paul" at Rome reference combined with the Latin above makes clear that the source is Hegesippus. All of this comes from the second century. Clement used a version of Hegesippus where - according to Turner and others - where the author was identified as "Josephus the Jew." The chronology was composed in the "tenth year of Antoninus (Pius)" or 147 CE. Celsus knew this text. Irenaeus used this text. Clearly the "Clement" who used this material was one and the same with Clement of Alexandria.
Harnack also notes that:
Thaddaeus et Judas in Britio Edessenorum
Likely comes from a period even later, closer to 190 CE, further cementing the connection with Clement.
