Constance Blackhall

 was an ancestor of Obadiah Blackhall who is mentioned in the Fallout 3 add-on Point Lookout.

Background
The Blackhall family was highly influential in the intense commercialization of Point Lookout. When Constance was left widowed by the New Plague in 2058, she opened talks with Isla Negra Holdings which eventually led to the modernization of Pilgrim's Landing.

According to dialogue taken from the original, cut version of the Point Lookout quest The Dark Heart of Blackhall, Constance had an "obsession with the occult". This obsession was shared with her brother, Richard Dunwich, owner of the company that built the Dunwich Building.

Appearances
is mentioned only in the Fallout 3 add-on Point Lookout.