UAE Founding Father, the late Sheikh Zayed bin Sultan Al Nahyan, and Saudi Arabia's Crown Prince Fahd bin Abdulaziz Al Saud, at the first Opec summit in Algiers, 1975. Getty Images
Sheikh Khalifa bin Zayed, UAE President, attends the opening session of the Opec summit in Riyadh, 2007. Getty Images
Suhail Al Mazrouei, UAE Minister of Energy and Infrastructure, Mohammad Sanusi Barkindo, Opec Secretary General, Khalid Al Falih and Alexander Novak, also of Opec, hold a press conference after a meeting in Vienna, 2018. EPA
Mr Al Mazrouei with Ali Al Naimi, Saudi Oil Minister, and Ali Saleh al Omair, his Kuwaiti counterpart, at the opening session of the Arab Energy Conference in Abu Dhabi, 2014. AFP
Venezuelan President Hugo Chavez meets Sheikh Khalifa bin Zayed, UAE Crown Prince at the time, in Abu Dhabi, August 2000. AFP
Mr Al Mazrouei in Vienna, 2018. Bloomberg
Mana Al Otaiba, UAE Minister of Petroleum and Mineral Resources, speaks during an Opec conference in Abu Dhabi, December 1978. Getty Images
Sheikh Zayed and Mohammad Reza Pahlavi, the Shah of Iran, at the Opec summit in Algiers, 1975. Getty Images
Mohamed Al Hamli, UAE Oil Minister, takes centre stage at the Opec conference in Abu Dhabi, December 2007. EPA
Mr Al Mazrouei speaks during the Gulf Intelligence UAE Energy Forum in Abu Dhabi, 2016. AFP
Obaid bin Saif, President of the Opec conference, with Opec Secretary General Rilwanu Lukman before the group's meeting in Vienna, June 1998. EPA
Opec ministers meet in Abu Dhabi to set a new price for crude oil, 1978. Getty Images