Sheikh Rashid bin Mohammad bin Rashid Al Maktoum of Dubai passed away Saturday of an apparent heart attack, according to USA Today. Rashid, the oldest son of the Dubai ruler Sheikh Mohammad bin Rashid Al Maktoum, was 33 years old, and he was laid to rest at Bur Dubai's Umm Hurair cemetery late Saturday with his father praying over him.

The Emirates flags will be flown at half-mast during the three-day mourning.

Sheikh Rashid was the older brother to the heir to the Dubai throne, Sheikh Hamdan. Their father is the Prime Minister of The United Arab Emirates, in addition to the ruler and vice president of Dubai. The United Emirates is a federation of seven sheikhdoms, which includes Dubai.

Sheikh Rashid was also an avid sportsman, reported FOX News. He was a founding member of Dubai Sports and Cultural Club, a horse racing enthusiast, an UAE Olympic Committee Chairman from 2008-2012, an individual and team endurance gold medal winner in the equestrian events at the 15th Asian Games in 2006 and a United Manchester football fan.

"Today, I lost a best friend and a childhood companion, my dear brother Rashid," said Sheikh Hamdan bin Mohammed bin Rashid Al Maktoum, Crown Prince of Dubai and Chairman of the Dubai Executive Council, according to Sports 360.  "You will be missed."