<P> William Henry Harrison Sr. ( February 9 , 1773 -- April 4 , 1841 ) was an American military officer , a principal contributor in the War of 1812 , and the ninth president of the United States ( 1841 ) . He was the last president born before the American Revolution , and died of pneumonia just 31 days into his term , thereby 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 unsettled Constitutional questions as to the presidential line of succession until the passage of the Twenty - fifth Amendment to the United States Constitution in 1967 . Harrison was a son of Founding Father Benjamin Harrison V and in turn was the paternal grandfather of Benjamin Harrison , the 23rd United States President ( 1889 -- 1893 ) . </P>
<P> William Henry Harrison Sr. ( February 9 , 1773 -- April 4 , 1841 ) was an American military officer , a principal contributor in the War of 1812 , and the ninth president of the United States ( 1841 ) . He was the last president born before the American Revolution , and died of pneumonia just 31 days into his term , thereby 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 unsettled Constitutional questions as to the presidential line of succession until the passage of the Twenty - fifth Amendment to the United States Constitution in 1967 . Harrison was a son of Founding Father Benjamin Harrison V and in turn was the paternal grandfather of Benjamin Harrison , the 23rd United States President ( 1889 -- 1893 ) . </P>
who was the president who died of pneumonia
who was the president who died of pneumonia
William Henry Harrison Sr.
William Henry Harrison Sr.