He served for fifty years as minister of the Second Congregational
Church (Unitarian) in Worcester, Massachusetts, formed after the
town voted not to call Bancroft to its First Parish due to his
liberal persuasion. Aaron Bancroft held that Jesus Christ was
morally heroic but not divine. In 1807 he published his Life
of General Washington. He served as the first president of
the American Unitarian Association. The noted American historian,
George Bancroft, was his son.