The most renowned of the Seljuqi Sultans. Seljuqi Malik Shah's reign (1072-92) and that of his father Alp Arslan (1063-72) covered the most brilliant period of Seljuq dynasty. He subdued the whole of Syria and Egypt, conquered Bukhara, Samarqand and Khrarizm. The caliph of Baghdad, al Muqtadi, became a puppet who moved at the will of Malik Shah and his name was mentioned with that of the Caliph in the Friday sermons. His kingdom extended from Kashgar to Jerusalem and in width from Constantinople to the Caspian Sea. Seljuqi was more than a ruler of an extensive empire. He built roads and mosques, dug canals, patronised men of learning, invented an era called Tarikh jalali (his surname was jalaluddin). This calendar according to some scholars is "somewhat more accurate than ours".