During a Mamaluke invasion he and King Leo IV of Armenia got into a severe disagreement over how to deal with the situation.
The dispute grew so large that Jacob threatened Leo with the vengeance of the church.
Mukhitar Ter Mukhik from the village of Curnah was elected pontiff in his place.
In 1347 the new King Constantine II, King of Armenia began a conversation with the pope in Avignon about religious affairs and sent former Catholicos Jacob on a mission to see Pope.
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