William
Henry
Harrison Sr

William Henry Harrison Sr. (February 9, 1773 – April 4, 1841) was the ninth President of the United States (1841), an American military officer, and the last president born as a British subject. He was 68 years, 23 days old at the time of his inauguration. He died of complications from pneumonia 31 days into his term, serving the shortest tenure in United States presidential history. He was the first president to die in office, and his death sparked a brief constitutional crisis. Its resolution left many unsettled questions following the presidential line of succession in regard to the Constitution until the passage of the Twenty-fifth Amendment to the United States Constitution in 1967. He was the grandfather of Benjamin Harrison, who served as the 23rd United States President from 1889 to 1893.