St. Vrain, Marcellin, frontiersman (Oct. 17, 1815-Mar. 4, 1871). Born at Spanish Lake, Missouri, he was a younger brother of Ceran St. Vrain. Marcellin was educated and reached Bent's Fort about 1835. He managed Fort St. Vrain on the South Platte from about 1837, closing it down in 1845. He married first a Sioux woman, then a Pawnee, having children by each. St. Vrain retired from the mountains to St. Louis in 1848, where he married an Irish woman. He died a suicide, reportedly. He was short and slight and had an engaging personality.