William Henry Harrison (February 9, 1773 - April 4, 1841) was the ninth President of the United States (1841), an American military officer and politician, and the first president to die in office. He was 68 years, 23 days old when inaugurated, the oldest president to take office until Ronald Reagan in 1981. Harrison died on his 32nd day in office of complications from pneumonia, serving the shortest tenure in United States presidential history. His death sparked a brief constitutional crisis, but its resolution settled many questions about presidential succession left unanswered by the Constitution until the passage of the 25th Amendment in 1967. He was the grandfather of Benjamin Harrison, who was the 23rd President from 1889 to 1893. Before election as president, Harrison served as the first territorial congressional delegate from the Northwest Territory, governor of the Indiana Territory and later as a U.S. representative and senator from Ohio. He originally gained national fame for leading U.S. forces against American Indians at the Battle of Tippecanoe in 1811, where he earned the nickname "Tippecanoe" (or "Old Tippecanoe"). As a general in the subsequent War of 1812, his most notable action was in the Battle of the Thames in 1813, which brought an end to hostilities in his region. This battle resulted in the death of Tecumseh and the dissolution of the Indian coalition which he led. After the war, Harrison moved to Ohio, where he was elected to the United States House of Representatives. In 1824 the state legislature elected him to the US Senate. He served a truncated term after being appointed as Minister Plenipotentiary to Colombia in May 1828. In Colombia, he spoke with Simon Bolivar urging his nation to adopt American-style democracy. Returning to his farm in Ohio, Harrison lived in relative retirement until nominated for the presidency in 1836. Defeated, he retired again to his farm. He was elected president in 1840, and died of pneumonia in April 1841, a month after taking office."