Ceran St. Vrain, born Ceran de Hault de Lassus de Saint-Vrain, was the son of a French aristocrat who emigrated to the Spanish Louisiana in the late 18th century; his mother was from St. Louis, where he was born. To gain the ability to trade, in 1831 he became a naturalized Mexican citizen in what is now the state of New Mexico. He formed a partnership with American traders William, George and Charles Bent; together they established the trading post of Bent's Fort. It was the only privately held fort in the West.

The siege of Pueblo de Taos was the final battle during the main phase of the Taos Revolt, an insurrection against the United States during the Mexican–American War. It was also the final major engagement between American forces and insurgent forces in New Mexico during the war.