After having brought stability in Khurasan, Abu'l-Hasan Muhammad Simjuri soon went to war with the Buyids, who had in that year expelled the Samanids' Ziyarid vassals from Tabaristan and Gurgan on the southern shores of the Caspian Sea. The death of Vushmgir, the Ziyarid prince, a few years later caused an end to hostilities, and the Buyid 'Adud al-Dawla paid tribute to the Samanids.[3] This tribute did not last for long, however, and Mansur continued to have difficulties in raising money.