World Sultan Qaboos, Who Built Oman Into a Prosperous Oasis of Peacemaking, Dies at 79 January 11, 2020January 12, 2020BEN HUBBARDComments Off on Sultan Qaboos, Who Built Oman Into a Prosperous Oasis of Peacemaking, Dies at 79 The longest-serving Arab ruler, Qaboos pulled his nation from poverty and brokered quiet talks between global foes.