Ecclesiastical Chronicle, Volume 3

After Abraham: Jacob.

This man also was of the lineage of Joseph the carpenter. He was chosen and ordained in Jerusalem and sent to the East. He was given to voluntary poverty and was an ascetic. After he completed eighteen years, he died and was buried in Seleucia. In his time, there was Porphyry the Sicilian, who attacked the Gospel.

After Jacob: Achadabues.

Because of the great resemblance that they saw in him to his father, he was called by this name. When Jacob was dying, he had commanded that two of his disciples, Achadabues and Kamjesus, should go to Antioch, and whichever of them the Patriarch of Antioch willed, he should ordain him and send him. They did so. When they entered Antioch, they began to stay in the house of a certain believer. Soon they were accused before the ruler of the city in Antioch, that they had come from the land of the Persians as spies. They were imprisoned in that very house of the believer; Achadabues, however, escaped.

7. After Abraham: JACOB.

He also was of the lineage of Joseph the carpenter. He was elected and consecrated at Jerusalem and sent to the East. He was devoted to voluntary poverty and was an ascetic; he performed his duty for eighteen years¹ and died, and was buried at Seleucia. In his time lived Porphyry² the Sicilian, who attacked the Gospel.

8. After Jacob: ACHADABUES³.

Because of his great resemblance to his father, he was called by this name. Jacob, when dying, had ordered that two of his disciples, Achadabues and Kamjesus, should go to Antioch so that the Antiochene patriarch might consecrate one of them whom he wished and send him back. They did this, and when both arrived in Antioch together, they used the hospitality of a certain believer's house. But soon they were accused before the prince of Antioch of having arrived from the region of the Persians for the purpose of spying, and they were cast into the very house in which they were captives. Achadabues indeed fled.

Footnote 1: Barhebraeus is followed by Assemanus in Bibliotheca Orientalis, III, part I, 612. In Guriel's Chronotaxis of the Chaldean Patriarchs, he is said to have sat for 27 years. Amr places his death in the year of the Greeks 501, or Christ 190; if this is true, the see would have been vacant for at least 13 years after the death of Abraham.
Footnote 2: Porphyry was born circa the year 233.
Footnote 3: Achadabues is literally "brother of his father."