From Ian Wilson Jesus: The Evidence:
“…Church tradition that a contingent of them (Jewish-born Christians) headed for Pella on the east bank of the Jordan. These, later variously to be labelled ‘Nazarenes’ and ‘Judaeo-Christians’, appear to have had as their gospels both an early Aramaic version of the Matthew gospel and the ‘Gospel of the Hebrews’, both long lost. As some evidence of their settlement in Pella, excavations in 1967 of Pella’s ancient West Church revealed a sarcophagus beneath the apse, which judging from its Jewish style of decoration and Christian context may once have belonged to an early leader of this community.
But according to the tenth-century patriarch Eutychius, who seems to have had access to earlier documents no longer extant, at least some of the Judaeo-Christians ‘returned to Jerusalem in the fourth year of the Emperor Vespasian * and built there their church’. What may well be remains from this church have recently been identified by Benedictine monk Bargil Pixner in a dressed stone edifice erroneously labelled ‘the Tomb of David’ tucked amidst a complex of buildings next to the Dormition Church on Jerusalem’s south-western hill today called Mount Zion. Comprising part of a later Church of the Apostles (thought to mark the house with the upper room where the apostles assembled after Jesus’ ascension), this edifice has in the lower parts of its walls massive and beautifully dressed stones of exactly the type used for Herod’s Temple…they seem to have been rescued from the rubble of the Temple site ( a salvage operation we might expect of the Temple-going Jerusalem Christians of Acts 2:43-7), and used for a synagogue style building, in which regard a particularly tell-tale feature is that this is not oriented to the Temple, as any true synagogue would have been, but to the tomb of Jesus as marked by the site of the Church of the Holy Sepulchre.
If this thinking is correct, this very early church would have been constructed on the orders of Simeon, son of Cleopas, who is recorded to have succeeded James, brother of Jesus, as head of Jerusalem’s Judaeo-Christian community. Since Simeon’s father, Cleopas (almost certainly the same Cleopas to whom Jesus appeared on the road to Emmaus, Luke 24:13-35), was the brother of Jesus and James’ father Joseph, Simeon would have continued Jesus and James’ own Davidic blood-line, there apparently followed thirteen other ‘Bishops of Jerusalem’, some also with this same blood-line.”
Not sure this helps.

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