James, the head of the early church in Jerusalem, was actually Matthew the Evangelist's younger brother rather than the brother of the Lord? Seriously? And Matt left his "title" with young Jimmy? ("If I don't come back, you're the bishop, bro.") Wow! I didn't know the episcopal See was transferrable that way in first century Jerusalem. I bet Peter was ticked!
Mat 10:1-4
Then Jesus summoned his twelve disciples and gave them authority over unclean spirits, to cast them out, and to cure every disease and every sickness. These are the names of the twelve apostles: first, Simon, also known as Peter...Thomas and Matthew the tax collector; James son of Alphaeus...
Mark 6:7
He called the twelve and began to send them out two by two and gave them authority over the unclean spirits.
Mark 3:13 ...So he appointed the twelve...
Mark 2:14
And as he passed by, he saw Levi the son of Alphaeus sitting at the tax booth, and he said to him, “Follow me.” And he rose and followed him.
Saint Jerome
Do you intend the comparatively unknown James the Less, who is called in Scripture the son of Mary, not however of Mary the mother of our Lord, to be an apostle, or not? If he is an apostle, he must be the son of Alphæus and a believer in Jesus, "For neither did his brethren believe in him."
Saint Matthew left Jerusalem after completing his Gospel. All of the Apostles left to the four concerns of the earth to preach the Gospel.
Peter went to Rome as the Prime Apostle.
James stayed as Bishop of Jerusalem.
Saint Matthew established the Orthodox Church of Ethiopia, thus Bishop.
But Matthew stayed in Jerusalem for a bit with is little brother James, thus he was Bishop of Jerusalem for a little while.
This is what I was told by an Ethiopia Priest.