Muscat is also home to the Al Alam Palace – the ceremonial home of Qaboos bin Said Al Said. And who is he? He’s the sultan of Oman, and has been since July 23 1970. This means he has been on the throne for more than 47 years – an impressive regal innings which currently ranks as the third lengthiest on the planet. Only Hassanal Bolkiah, the sultan of Brunei, and our own Elizabeth II, have been crowned for longer.