Virginia stamp distributor.

Served in armed forces in Seven Years’ War. Represented Frederick County in House of Burgesses (1761-62). Traveled to England as agent for the Ohio Company of Virginia, of which his father was secretary (1763). Sought to promote western development and secure additional grants of land but was unsuccessful, due largely to circumstances beyond his control. Briefly returned to Virginia as a stamp distributor (1765). Spent the remainder of his life in England and France. Became heavily indebted, mortgaged Virginia property, and ultimately lost his mind.

Son of John and Catherine (Mason) Mercer of Virginia. Married Mary Neville (1767); no issue.