When Rebecca Beall was born in 1760, in Hagerstown, Washington, Maryland, United States, her father, Col. Samuel Beall, was 47 and her mother, Eleanor Brooke, was 44. She married Robert Clark on 29 November 1785, in Reisterstown, Baltimore, Maryland, United States. They were the parents of at least 1 son and 2 daughters. She died after 1815, in Dayton, Montgomery, Ohio, United States, at the age of 56.