Eleanor Calvert was born in 1754 at Mount Airy in Prince George’s County, Maryland, the daughter of Benedict Swingate Calvert and Elizabeth Calvert. Her father was the acknowledged but illegitimate son of Charles Calvert, fifth Baron Baltimore, connecting Eleanor to Maryland’s former proprietary family. She grew up at Mount Airy within a wealthy, cultivated, and politically connected household sustained by plantation agriculture and enslaved labor. Eleanor received the domestic and social education expected of an elite Maryland daughter. She learned reading, writing, religion, music, needlework, household accounts, and the etiquette of hospitality. The Calvert home connected her with planters, officials, and visitors from both Maryland and Virginia. Precise details of tutors and schooling are limited. In 1774 she married John Parke Custis, the son of Martha Washington and stepson of George Washington. The marriage linked the Calvert, Custis, and Washington families. Eleanor became mistress of a large household and gave birth to seven children, four of whom survived infancy: Elizabeth, Martha, Eleanor, and George Washington Parke Custis. John Custis died of camp fever in 1781 after serving at Yorktown. Eleanor was left a widow at about twenty-seven. George and Martha Washington took the two youngest children to raise, while the elder daughters remained primarily with their mother. In 1783 Eleanor married Dr. David Stuart, a physician and political figure, and created a blended household that included many additional children. Before later family connections made her historically prominent, Eleanor had been shaped by proprietary Maryland ancestry, plantation privilege, private female education, early marriage, repeated childbirth, wartime anxiety, widowhood, and the painful division of her children between households. These experiences made family management and adaptation the central work of her early adult life.