1783 – Born in Horncastle, England, on the 8th of June.
1792 – In March the Sullys and their nine children immigrated to Richmond, Virginia, where Thomas’s uncle managed a theater.
1801 – Sully became a professional painter at age 18.
1804 – He then returned to Richmond to learn "miniature & Device painting" from his elder brother Lawrence Sully.
1801 – Sully’s own index indicates that he produced 2631 paintings, most of which are currently in the United States.
1809 – He traveled to London for nine months of study under Benjamin West.
1810 – He returned, and made Philadelphia his home.
1837-1838 – He was in London to paint Queen Victoria at the request of Philadelphia’s St. George’s society.
1872 – Sully died in Philadelphia on the 5th of November, where he had spent the majority of his long and successful career. He is buried in the Laurel Hill Cemetery.