Hasan-i Sabbah had both his sons executed and left Alamut to a lieutenant from another castle

Hasan-i Sabbah took the fortress of Alamut in 1090 by infiltration. He had entered it under another name, and he gave its castellan a draft for 3,000 dinars payable by the governor of Damghan. From Alamut he founded the Nizari Ismaili state in Persia and built a large library. He had a wife, two daughters and two sons. During a siege he sent his wife and daughters to the castle of Girdkuh, where they lived by spinning, and they never came back. He had both sons executed. Muhammad was put to death for drinking wine. Ustad Husayn was put to death for a suspected role in the murder of a missionary; one account says that charge later proved false. Hasan died after a short illness on 12 June 1124. Before he died he named Kiya Buzurg-Umid, his commander at the castle of Lamasar, as his successor at Alamut. Leadership then passed in Buzurg-Umid's family: his son Muhammad succeeded him in 1138. Hasan was buried near Alamut, and Nizari Ismailis visited his tomb. The Mongols destroyed the tomb when they took Alamut in 1256.