P. B. S. Pinchback
Pinckney Benton Stewart Pinchback was an American publisher and politician, a Union Army officer, and the first person of African descent to become governor of a U.S. state. He was born free in Georgia. A Republican, Pinchback served as the 24th Governor of Louisiana from December 9, 1872, to January 13, 1873. He was later elected to the state legislature, serving in 18791880.
He was born free as Pinckney Benton Stewart in May 1837 in Macon, Bibb County, Georgia. His parents were Eliza Stewart, a freed slave, and Major William Pinchback, a white planter and his mothers former master. William Pinchback, who also had a legal white family, freed Eliza and her children in 1836 she had borne six by that point and two had survived. She had four more with him.
Source: Wikipedia