After the Battle of Chaldiran, Ismail lost his supernatural air and the aura of invincibility, gradually falling into heavy drinking of alcohol. He retired to his palace, never again participated in a military campaign, and withdrew from active participation in the affairs of the state. He left these to his "vizier", Mirza Shah Husayn, who became his close friend and drinking companion. This allowed Mirza Shah Husayn to gain influence over Ismail and expand his authority. Mirza Shah Husayn was assassinated in 1523 by a group of Qizilbash officers, after which Ismail appointed Zakariya's son Jalal al-Din Mohammad Tabrizi as his new "vizier". Ismail died on 23 May 1524 at the relatively early age of thirty-six. He was buried in Ardabil, and was succeeded by his son Tahmasp I.