Stowe provides further details about her story based on actual events in A Key to Uncle Tom’s Cabin.
“The character of St. Clare cannot fail to inspire love and admiration. He is thebeau idéal of a Southern gentleman—honourable, generous, and humane—of accomplished manners, liberal education, and easy fortune. In his treatment of his slaves, he errs on the side of lenity, rather than rigour; and is always their kind protector, from a natural impulse of goodness, without much reflection upon what may befall them when death or misfortune shall deprive them of his friendship.” (pg. 119)
The full story of this connection can be read in Chapter XIV, “The Spirit of St. Clare” of A Key to Uncle Tom’s Cabin.