Josiah Henson 
The Life of Josiah Henson, Formerly a Slave, Now an Inhabitant of Canada, as Narrated by Himself [EPUB ebook] 

Josiah Henson (June 15, 1789 – May 5, 1883) was an author, abolitionist, and minister. Born into slavery in Charles County, Maryland, he escaped to Upper Canada (now Ontario) in 1830, and founded a settlement and laborer’s school for other fugitive slaves at Dawn, near Dresden in Kent County. Henson’s autobiography,  
The Life of Josiah Henson, Formerly a Slave, Now an Inhabitant of Canada, as Narrated by Himself (1849), is widely believed to have inspired the character of the fugitive slave, George Harris, in Harriet Beecher Stowe’s 
Uncle Tom’s Cabin (1852).