David Lloyd George, 1st Earl Lloyd-George of Dwyfor OM PC (17 January 1863 26 March 1945) was the only Welsh Prime Minister of the United Kingdom and also the only one to have English as a second language (Welsh being his first language). He was also the last Liberal Prime Minister.
He was a key player in introducing the groundwork for the Welfare State. He was Prime Minister throughout the latter half of World War I and the first four years of the subsequent peace. In 1918 he was universally popular and promised to make a land "fit for heroes to live in". However his coalition government was roundly unpopular with his own party (who where just under a third of it and by the time it was over the party had wrecked itself as a political force, fading into obscurity and being replaced by Labour).
Lloyd George was also a key player in The Irish Question. His time in power saw revolution in Ireland and the eventual negotiations that led to the establishment of the Irish Free State and creating the UK as it is known today. Opinion is divided on how well he dealt with the crisis, but for many years afterwards he was hailed (in Britain) as having solved the question for good. Later historians have tended towards a more critical view.
During the 1930's and 40's, Lloyd George had become something of a Nazi sympathiser, to the point that even after World War II broke out he said that the UK should try to negotiate a truce with Hitler.
He was also infamous as a womaniser, leading to the a famous music hall song called Lloyd George Knew My Father, the joke being that Lloyd George was the singer's father. Two of his actual children followed him into politics, but moved to different parties after his death: his son Gwilym became a Conservative MP, eventually rising to become Home Secretary in Anthony Eden's government, while his daughter Megan became a Labour MP.
There was also a scandal about selling peerages during this period.
He ended at #79 in 100 Greatest Britons.