John Carlyle was born on February 6, 1720, in Dumfries, Scotland, the son of William Carlyle and Rachel Murray Carlyle. He grew up in a region with strong trading connections to the Atlantic world. As a younger man without a great landed inheritance, he sought opportunity overseas and migrated to Virginia during the 1740s. Carlyle’s education was practical and commercial. He learned reading, writing, bookkeeping, credit, shipping, and the evaluation of tobacco and imported goods. Whether through family instruction or apprenticeship, these skills prepared him for work in the Potomac trade. Virginia’s expanding settlements offered ambitious merchants a chance to accumulate land and influence more rapidly than might have been possible in Scotland. He settled at the developing port of Alexandria and formed partnerships with other Scottish merchants. Carlyle imported manufactured goods, exported tobacco and agricultural products, invested in land, and extended credit. His success allowed him to construct an imposing stone house that became one of Alexandria’s social and commercial landmarks. His businesses and household relied upon enslaved labor as well as hired and indentured workers. In 1749 Carlyle married Sarah Fairfax, daughter of William Fairfax of Belvoir. The marriage connected the immigrant merchant to one of Virginia’s most powerful families and strengthened his entry into colonial public life. Sarah died young, and Carlyle later married Sybil West. He endured the deaths of spouses and several children, losses common even in prosperous households. Before serving as a militia officer and Patriot official, Carlyle had been shaped by Scottish birth, migration, mercantile training, entrepreneurial risk, strategic marriage, property building, and family bereavement. His rise from immigrant merchant to Virginia gentleman illustrates the opportunities of the eighteenth-century Chesapeake, but also its dependence on Atlantic credit, tobacco, and slavery. Those formative commercial habits later influenced how he organized supplies and local defense during imperial and revolutionary wars.