 Shah Shoja then occupied Azerbaijan and Arran for four months, until he was forced to turn back when internal conditions in Fars deteriorated.His second brother Shah Muzaffar's son, Shah Yahya, rose in revolt in Isfahan.Having to make peace with the Jalayirids, Shah Shoja offered to marry his son Zain al-Abidin to a sister of the Jalayirid ruler Shaikh Hussain Jalayir.