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Meriwether Lewis (August 18, 1774–October 11, 1809) was an American explorer, soldier, and public administrator, best known for his role as the leader of the Lewis and Clark Expedition also known as the Corps of Discovery, with William Clark, whose mission was to explore the territory of the Louisiana Purchase.
Meriwether Lewis was born in Albemarle County, Virginia, to Colonel William Lewis (1735 – 1777) who was of Welsh ancestry, and Lucy Meriwether (4 February 1752 – 8 September 1837). He moved with his family to Georgia when he was ten. It was there that he met Eric Parker, who was the first to introduce him to the idea of traveling. At thirteen, he was sent back to Virginia for education by private tutors. One of these was Parson Matthew Maury, an uncle of Matthew Fontaine Maury. Parson Maury was a son of Charles Goodyear Maury who was Thomas Jefferson's teacher for two years. In 1793, Lewis graduated from Liberty Hall (now Washington and Lee University), joined the Virginia militia, and in 1794 he was sent as part of a detachment involved in putting down the Whiskey Rebellion.
In 1801, he was appointed as an aide by President Thomas Jefferson, whom he knew personally through Virginia society in Albemarle County. Lewis resided in the White House, and frequently conversed with various prominent figures in politics, the arts and other circles.  Originally, he was to provide information on the politics of the United States Army, which had seen an influx of Federalist officers as a result of John Adams's "midnight appointments."  When Jefferson began to formulate and to plan for an expedition across the continent, he chose Lewis to lead the expedition.
Jefferson selected Captain Meriwether Lewis to lead the proposed expedition, afterwards known as the Corps of Discovery. Lewis became intimately involved in planning the expedition and was sent by Jefferson to Philadelphia, Pennsylvania, for instruction in cartography and other skills for making scientific observations. In June 1803, Jefferson provided Lewis with basic objectives for the mission, focusing on the exploration of the Missouri river and any related streams which might provide access to the Pacific Ocean.
Lewis concluded the expedition would benefit from a co-commander and, with Jefferson's consent, offered the assignment to his friend and former commanding officer, William Clark. Clark and Lewis were both relatively young and adventurous and had shared experience as woodsmen-frontiersmen and Army officers. However the two men were quite different in education and temperament. Lewis was introverted and moody while Clark was extroverted, even-tempered and gregarious. Lewis, who had a better education, possessed a philosophical and speculative outlook and was at home with abstract ideas. Clark was more pragmatic and practical. Because of bureaucratic delays in the U.S. Army, Clark officially only held the rank of Second Lieutenant at the time, but Lewis concealed this from expedition members and shared the leadership of the expedition, always referring to Clark as "Captain". 
Lewis departed Pittsburgh for St. Louis—the capital of the new Louisiana Territory—via the Ohio River in the summer of 1803, gathering supplies, equipment, and personnel along the way. Between 1804 and 1806, the Corp of Discovery explored thousands of miles of the Missouri and Columbia River watersheds, searching for an all-water route to the Pacific Ocean. Generally sharing leadership responsibilities with William Clark, although technically the leader, Lewis led the expedition safely across the Rocky Mountains to the Pacific and back, with the loss of just one man, Charles Floyd, who died of apparent appendicitis. In the course of the journey, Lewis observed, collected, and described hundreds of plants and animal species previously unknown to science. The expedition was the first point of Euro-American contact for several Native American tribes; through translators and sign language, Lewis conducted rudimentary ethnographic studies of the peoples he encountered, even as he laid the groundwork for a trade economy to ensure American hegemony over its vast new interior territory. 
On August 11, 1806, near the end of the expedition, Lewis was shot in the left thigh by Pierre Cruzatte, a near-blind man under his command, while both were hunting for elk. His wound hampered him for the rest of the journey. 
Return and gubernatorial duties
After returning from the expedition, Lewis received a reward of 1,600 acres of land. In 1807, Jefferson appointed him governor of the Louisiana Territory; he settled in St. Louis, Missouri. Lewis was a good administrator, but due to quarreling local political leaders, approval of trading licenses, land grant politics, Indian depradations, slow moving mail system, it appeared that Lewis was a poor administrator and one who failed to keep in touch with his superiors in Washington.
Lewis was a Freemason, initiated, passed and raised in Door To Virtue Lodge No. 44 in Albemarle, VA between 1796 and 1797. On August 2, 1808, Lewis and several of his acquaintances submitted a petition to the Grand Lodge of Pennsylvania in which they requested a dispensation to establish a lodge in St. Louis. Lewis was nominated and recommended to serve as the first Master of the proposed Lodge, which was warranted as Lodge No. 111 on September 16, 1808. 
- ↑ Corps of Discovery > The Leaders > Meriwether Lewis, National park Service website, accessed 5/29/08.
- ↑ 2.0 2.1 Ambrose, Stephen. Undaunted Courage: Meriwether Lewis, Thomas Jefferson, and the Opening of the American West. Simon & Schuster: 15 February 1996. ISBN 0-684-81107-3.
- ↑ Undaunted Courage, Stephen Ambrose, pg.385
- ↑ PBS - THE WEST - Meriwether Lewis
- ↑ Dunslow's 10,000 Famous Freemasons Missouri Lodge of Research, 1959.
- ↑ Pa Freemason May 03 - Treasures of the Temple