Alec Douglas-Home
When he was chosen as Leader of the Conservative Party after Harold Macmillan retired, he knew it would be difficult to lead a government from the House of Lords. So he renounced his title, four days after becoming Prime Minister. Once he renounced the title, he became simply Sir Alec Douglas-Home. He had been made a Knight of the Thistle in 1962. Finally, after he lost the election of 1964, he was given a life peerage, titled 'Baron Home of the Hirsel'. That title is not hereditary but, after his death, his son became the 15th Earl of Home.