Records of Prime Ministers of the United Kingdom transitions between reigns, eight Prime Ministers each served under two sovereigns: George III had 14 Prime Ministers serving during his 59-year reign (reigned 1760–1820), beginning with the Duke of Newcastle. The last incumbent, Lord Liverpool, was the only one appointed by his son (the Prince Regent) during the father's final incapacity to rule. In downward numerical order, numbers of Prime Ministers in office during other reigns are: Only six Prime Ministers came to serve office under sovereigns in whose own reigns they were born. The present Prime Minister, Theresa May, is the third Prime Minister to have been born in
Historical rankings of Prime Ministers of the United Kingdom Historical rankings of Prime Ministers of the United Kingdom "The Times" constructed a poll for the first time of all British prime ministers in the lead-up to the 2010 general election. Before this there were two polls in 1999 and 2000, carried out by BBC Radio 4 and the British Politics Group—both consulted only a relatively small number of experts. A wider-reaching poll was conducted in 2004 by the University of Leeds and Ipsos MORI. All rankings involved only prime ministers from the 20th and 21st centuries. In 2004, the University of Leeds and Ipsos Mori conducted an online survey