Iltutmish, also called Shams al-Dīn Iltutmish, Iltutmish also spelled Altamsh, (died April 29, 1236), third and greatest Delhi sultan of the so-called Slave dynasty. Iltutmish was sold into slavery but married the daughter of his master, Quṭb al-Dīn Aibak, whom he succeeded in 1211.