As ruler's representative and crown prince: 1966–1971 When his father, Zayed, became emir of Abu Dhabi in 1966, Khalifa was appointed the ruler's representative in the
Eastern Region of Abu Dhabi and head of the Courts Department in Al Ain. Zayed was the ruler's representative in the Eastern Region before he became the emir of Abu Dhabi. A few months later the position was handed to
Tahnoun bin Mohammed Al Nahyan. On 1 February 1969, Khalifa was nominated the crown prince of Abu Dhabi, and on the next day he was appointed head of the Abu Dhabi Department of Defense. In that post, he oversaw the build up of the Abu Dhabi Defense Force, which after 1971 became the core of the
UAE Armed Forces. In March 1976, His Highness took on the task of founding with his father and leading the Abu Dhabi Investment Authority (ADIA). This organization strategically oversees the emirate's financial investments with ensuring a stable income for future generations. In May 1976, he became deputy commander of the UAE Armed Forces, under the president. He also became the head of the
Supreme Petroleum Council in the late 1980s. The post granted him wide powers in energy matters. He was also the chairman of the Environmental Research and Wildlife Development Agency. In 1981, he established the Abu Dhabi Department of Social Services and Commercial Building as well as the Khalifa Housing Fund to help and support constructions of residential and commercial buildings. This initiative sparked construction around Abu Dhabi. In 2009, Khalifa was re-elected as president for a second five-year term. He was subsequently re-elected in 2014 and 2019. at Abu Dhabi International Airport, 13 January 2008 In 2010, Khalifa was described in a
WikiLeaks cable signed by then
U.S. ambassador Richard G. Olson as a "distant and uncharismatic personage." The cable said that Khalifa had risked his reputation and the UAE's future since 1990, when he described the United States as willing to shed blood to maintain international order and stability in the
Gulf. In March 2011, Khalifa sent the
United Arab Emirates Air Force to support the
military intervention in Libya against Muammar Gaddafi, alongside forces from
NATO, Qatar, Sweden and Jordan. Khalifa pledged the full support of the UAE to the Bahrain in the face of pro-democracy
uprising in 2011. Later that year Khalifa was ranked as the world's fourth-wealthiest monarch, with a fortune estimated to be worth $15 billion. In 2013, he commissioned
Azzam, the
longest motor yacht ever built and measuring long, with a cost between $400–600 million. In January 2014, Khalifa had a
stroke and was reported to have been in a stable condition after undergoing an operation. He was rarely seen in public after, and, with his health deteriorating, his brother, the crown prince, took over as the de facto ruler. == Personal life ==