Marcus Koenigheim was born in Westphalia about 1828. He immigrated to Philadelphia and then moved to San Antonio. During the Civil War he returned to Philadelphia, where he married Elizabeth Levyson; they had eight children. Koenigheim moved again to San Antonio and engaged in a prosperous mercantile business. In 1870 he lent $1,500 to Bart DeWitt, who purchased land in West Texas to lay out a town that he named St. Angela, but he was unable to pay back the loan within five years. Koenigheim took the land as payment and became one of the first town builders of St. Angela, which soon became known as San Angela, and finally as San Angelo. He was murdered by a burglar on October 9, 1893, at his home in San Antonio.