Eleanor Calvert Custis Stuart, born Eleanor Calvert, was a prominent member of the wealthy Calvert family of Maryland. Upon her marriage to John Parke Custis, she became the daughter-in-law of Martha Dandridge Custis Washington and the step-daughter-in-law of George Washington. Her portrait hangs today at Mount Airy Mansion in Rosaryville State Park, Maryland.

Baron Baltimore, of Baltimore, County Longford, was a title in the Peerage of Ireland. It was created in 1625 and ended in 1771, upon the death of its sixth-generation male heir, aged 40. Holders of the title were usually known as Lord Baltimore for short.