Valentine Sommereisen was the first resident Catholic priest in three large areas of the American West: southwestern Minnesota, the Dakota Territory, and western Kansas. Born 28 May 1829 in Rouffach, Alsace, a German-speaking part of eastern France, he was one of seven theology students who followed the missionary Fr. Augustin Ravoux to Minnesota in 1854. Sommereisen was ordained by Bishop Joseph Cretin 8 March 1856 in the second Cathedral of St. Paul, and his first assignment was to SS. Peter & Paul in Mankato. From there he ministered to 36 communities in 14 counties in southwest Minnesota, and many area families can trace ancestors’ baptisms, marriages, and funerals to his signature on parish records. At the site of St. Joseph Church, the first Catholic church in Brown County, completed in 1861, Fr. Sommereisen celebrated the first Mass, and he ministered to Catholics in nearby Leavenworth, Sleepy Eye, St. George, and St. Peter. During the U.S.-Dakota War of 1862, he joined Doctor W.W. Mayo in New Ulm 21–25 August caring for the defenders and their families. Fr. Sommereisen also accompanied Fr. Ravoux, baptizing and consoling 33 of the 38 Dakota Sioux who were hanged in Mankato on 26 December 1862. He moved west in 1871 to Yankton, then the capital of Dakota Territory, and from there visited various forts and stations along the Missouri River. In 1873, he provided services as chaplain to General George Armstrong Custer on the Yellowstone Expedition. In 1876 Father Sommereisen was appointed pastor at Hays, Kansas, with the care of six nearby Volga-German settlements and various railroad towns along the Kansas Pacific. After another appointment at Cottonwood Falls, Kansas, in 1878-79, he retired to a homestead near Hays, where he was a successful farmer, orchardman, and vintner, and during a period of drought briefly worked as a section hand on the railroad. He died 25 January 1897 at age 67 and was buried in St. Joseph's Cemetery in Hays.