Rukn ud din Kaikaus

Rukn ud-Din Kaikaus (, ) was the independent Sultan of Bengal reigning from 1291 to 1300 CE. He succeeded his father Nasiruddin Bughra Khan. In several inscriptions and coins he styled himself as Sultan bin al-Sultan bin al-Sultan , Sultan-us-Salatin .

On Muharram 692 AH corresponding to 1292-1293 CE, Kaikaus ordered Ikhtiyaruddin Firuz Aitigin to construct a mosque north of Maheswar in Bihar, on the banks of the Burhi Gandak River.

In mosque inscriptions he styled himself "the great Sultan, master of the necks of nations, the king of the kings of Turks and Persians, the lord of the crown, and the seal," as well as "the right hand of the vice regent of God"—that is, "helper of the caliph." On another mosque he even styled himself the "shadow of God"

Rukunuddin Kaikaus ruled Bengal for nine years and died in 1300. It is assumed that he was childless. He was succeeded by his probable brother, Shamsuddin Firoz Shah.