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 Canada ministers, this time splitting them into two lists. The long-serving prime ministers were ranked as follows: The short-term prime ministers were ranked as follows: Historical rankings of Prime Ministers of Canada Historical rankings of Canadian prime ministers are surveys conducted in order to construct rankings of the success of individuals who have served as Prime Minister of Canada. Ranking systems are usually based on surveys of academic historians, economists and political scientists. The rankings focus on the achievements, leadership qualities, failures and faults in office. "Note: Click the "sort" icon at the head of each column to view the rankings