Harriet Tubman was an African-American abolitionist, humanitarian, and Union spy during the U.S. Civil War. After escaping from captivity, she made thirteen missions to rescue over seventy slaves using the network of antislavery activists and safe houses known as the Underground Railroad. She later helped John Brown recruit men for his raid on Harpers Ferry, and in the post-war era struggled for women's suffrage.

Born into slavery in Dorchester County, Maryland, Tubman was beaten and whipped by her various owners as a child. Early in her life, she suffered a traumatic head wound when an irate slave owner threw a heavy metal weight at her, intending to hit another slave. The injury caused disabling seizures, headaches, and powerful visionary and dream activity, and spells of hypersomnia which occurred throughout her entire life. A devout Christian, she ascribed her visions and vivid dreams to premonitions from God.