In 1344, the Sarbadar ruler Wajih ad-Din Mas'ud, sought to increase his territorial domains, and thus in 1344 invaded the domains of Hasan II and the Paduspanid ruler Eskandar II in Mazandaran with several hostile minor dynasties allied against him.
He then turned around and defeated the Sarbadar garrison at Sari, cutting off Mas'ud's line of retreat.
When Hasan attacked his rear, however, and Eskandar II met him at his front, Mas'ud was surrounded.
However, the two sons of Kiya Afrasiyab, a powerful Chulabi nobleman, murdered Hasan while the latter was in a bath on April 17.
A son of Hasan managed to flee to the court of the Paduspanid ruler Eskandar II, who later tried to restore Bavand rule in Mazandaran, but failed to do so.