Samuel Vaughan (1720–1802) was an Anglo-Irish merchant, plantation owner, and political radical.

Richard Price was a Welsh moral philosopher, Nonconformist minister and mathematician. He was also a political reformer, pamphleteer, active in radical, republican, and liberal causes such as the French and American Revolutions. He was well-connected and fostered communication between many people, including Thomas Jefferson, John Adams, George Washington, Mirabeau and the Marquis de Condorcet. According to the historian John Davies, Price was "the greatest Welsh thinker of all time".