Elisha of Seleucia-Ctesiphon

Elishaʿ was Patriarch of the Church of the East during a period of schism from 524 to 537. Unlike his opponent Narsai, who was also consecrated as catholicus but has traditionally been considered an anti-patriarch, Elishaʿ is included in the traditional list of patriarchs of the Church of the East.

Elisha's patriarchate
The following account of Elishaʿ's reign is given by Bar Hebraeus:

Shila died after a while in office. Then a schism arose among the bishops. Some of them supported Elishaʿ, the son-in-law of Shila, and consecrated him catholicus in the church of Ctesiphon; while others supported a man called Narsai, and consecrated him catholicus in the great church of Seleucia. Each of them began to appoint bishops for the vacant churches, and ultimately Elishaʿ prevailed with the support of the king and shut up Narsai in a prison. Narsai died shortly afterwards, and Elishaʿ began to hope that he would be firmly established in the leadership; but the bishops assembled together and degraded him from his rank.