Hüsameddin Mahmud bin Ala al-Din

Hüsameddin Mahmud bin Ala al-Din ruled the Alaiye beylik from 1364 until at least 1374, succeeding his father. His reign was spent fighting Peter I of Cyprus: in 1364 Cypriot forces raided Alanya and stormed its harbor, whereupon Mahmud retaliated by landing on Cyprus and carrying off many captives.

In 1366 Peter attacked Alanya with twenty-two ships but was repulsed by Turkmen archers. After the reconquest of Antalya in 1373, Mahmud built Alanya's Gülevşen Mosque in 1374 to mark it.