 The royal family of Ternate converted to Islam during the reign of Marhum (1465–1486), making him the first King of Ternate that embraced Islam; his son and successor, Zainal Abidin (1486–1500) enacted Islamic Law and transformed the kingdom into an Islamic Sultanate; the title "Kolano" (king) was then replaced with Sultan.The peak of Ternate's power came near the end of the 16th century, under Sultan Baabullah (1570–1583), when it had influence over most of the eastern part of Sulawesi, the Ambon and Seram area, Timor island, parts of southern Mindanao and as well as parts of Papua.It frequently engaged in fierce competition for control of its periphery with the nearby Sultanate of Tidore.