King Mohammed VI of Morocco at the Morocco-GCC (Gulf Cooperation Council) summit in Riyadh, Saudi Arabia on April 20, 2016.
Bahrain ambassador Sheikh Fawaz bin Mohamed bin Khalifa (right) presents his credentials to King Willem-Alexander of the Netherlands at Noordeinde Palace in The Hague on February 17, 2016.
Bahrain's King Hamad bin Isa Al-Khalifa (left) with Russian president Vladimir Putin during a meeting in Sochi, Russia on February 8, 2016.
Below: Sheikh Mohammed bin Rashid Al Maktoum, who is ruler of Dubai and also prime minister and vice president of the United Arab Emirates, attends the 4th Summit of South American-Arab countries in Riyadh, Saudi Arabia on November 11, 2015.
Jordan's King Abdullah II and his wife, Queen Rania, observe a moment of silence during a memorial service today marking the tenth anniversary of the bombings at three hotels in Amman, Jordan that killed dozens of people and wounded more than 100.
French president François Hollande (right) welcomes King Hamad of Bahrain for a meeting at the presidential Élysée Palace in Paris on September 8, 2015.
Britain's Queen Elizabeth II, King Hamad of Bahrain, and Britain's Prince Andrew, Duke of York on day 3 of the Royal Windsor Horse Show on May 15, 2015 in Windsor, England.
Jordan's King Abdullah II (center) and Kuwait's emir Sheikh Sabah al-Ahmad al-Sabah (center-right) arrive for the Egypt Economic Development conference on March 13, 2015 in Sharm el-Sheikh, Egypt. (Photos by KHALED DESOUKI/AFP/Getty Images)