secured alliances between the United States and Missouri-area tribes, such as the Omaha and Ponca. He was especially effective among the Teton Sioux further upriver in present-day Minnesota, whom he organized to send war parties against tribes allied with the British. While securing these alliances, in 1814 Lisa took Mitain as a consort; she was the daughter of Big Elk, the principal chief of the Omaha people. (Lisa was still legally married to Polly, his first wife, but European-American men often took "country wives" among their Native American allies to build their relationships.) Later, the U.S. government recognized Lisa, calling his efforts as a "great service in preventing British influence" in the northern area. After the war's conclusion in 1815, Lisa renewed his yearly trade expeditions to the area, staying each winter at Fort Lisa, Nebraska. He eventually had two children with Mitain: Rosalie and Christopher. Later life After the war, Lisa's reputation in St. Louis improved as a result of his success in the fur trade and having aided the Americans. In 1815, he invited 43 Native American chiefs and headmen from various tribes living between the Mississippi and Missouri to the city to strengthen their alliance with the Americans, and entertained them for about three weeks. He conducted them to Portage des Sioux to meet with the commissioners William Clark, Edwards and Auguste Chouteau to sign treaties of friendship. About two years later, he hosted another 24 chiefs from the Pawnee, Missouri and Sioux before another treaty signing. In St. Louis, Lisa was considered an ally of the landed elite. He became more affiliated with leading American members of St. Louis, including Edward Hempstead, a land claims attorney, and Thomas Hart Benton, editor of the St. Louis Enquirer. In the fall of 1817, while the trader was on an expedition up the Missouri, his first wife Polly Lisa died. In 1818 Lisa was with most of the residents in St. Louis who turned out to welcome the newly assigned Bishop Louis William Du Bourg. He had decided to make St. Louis the seat of the diocese of Louisiana and the Floridas. Lisa and other Creole families pledged substantial funds to build a church (now called the Old Cathedral) near the river that was fit for the diocese. After his return from that year's expedition, on August 5, 1818 Lisa married the widow Mary Hempstead Keeny (a sister of