William Beanes was born on January 24, 1749, in Prince George’s County, Maryland, into a prosperous family of planters and landowners. He grew up in the region around Upper Marlboro, where tobacco agriculture, county courts, Anglican parishes, and Atlantic commerce ordered community life. The family’s social position gave him access to education and the opportunity to enter medicine, while its prosperity existed within Maryland’s slaveholding plantation economy. Little is recorded about his earliest schooling, but Beanes received the classical and practical preparation required of an eighteenth-century physician. Medical education was not standardized. A young man commonly studied under an established practitioner, read available medical texts, observed patients, and learned the preparation of drugs. Some Maryland physicians also attended lectures in Philadelphia or Britain, though surviving summaries do not establish every stage of Beanes’s training with certainty. By early adulthood he had qualified to practice and returned to Upper Marlboro. A country doctor traveled widely, treating injuries, fevers, childbirth complications, and chronic illnesses with limited instruments and imperfect knowledge. The work demanded stamina, discretion, and close familiarity with families across social ranks. It also helped Beanes acquire local influence beyond that derived from property. During the American Revolution he supported the Patriot cause and served as a physician, treating wounded soldiers. The war was the first major public setting in which his professional abilities became visible, but they rested on years of study and practice beforehand. He married Sarah Hawkins Hanson, further linking himself to established Maryland families, and developed a comfortable household and respected medical career. Before the War of 1812 made his detention famous and indirectly inspired “The Star-Spangled Banner,” Beanes had already lived most of a substantial life. His formative years were those of a Maryland planter’s son who converted family resources into professional training. Local practice, wartime medicine, marriage, property, and community trust—not later accidental celebrity—formed the foundation of his identity.