Prime Minister of Australia from 1915 to 1923
Source (Wikipedia): Billy Hughes

William Morris Hughes was an Australian politician who served as the seventh prime minister of Australia from 1915 to 1923. He led the nation during World War I, and his influence on national politics spanned several decades. He was a member of the federal parliament from the Federation of Australia in 1901 until his death in 1952, and is the only person to have served as a parliamentarian for more than 50 years. He represented six political parties during his career, leading five, outlasting four, and being expelled from three.