 The palace is the official venue for important functions such as royal birthdays, weddings, conferment of titles and receptions for local and foreign dignitaries.Istana Maziah was built to replace Istana Hijau (Green Palace) which was destroyed in a fire.Istana Hijau had been constructed during the reign of Sultan Omar (Baginda Omar) on 10 March 1870 (7 Zulhijjah 1286).