Yasyan got very little support from Seljuk governors and Ridwan in forming a united front to defend Antioch from the army of the First Crusade.
When the news about the approaching army of the First Crusade reached Antioch, Yagsyan tried to form a united front to defend Antioch. But because of jealousies between the Seljuk governors and the anarchy in the main sultanate after the death of Malik-Shah, he got very little support. Even Ridwan, whose domain was next to Antioch, sent only a small number of troops. 
