Charleston County and the city of Charleston, its county seat, are the most historic locations in the state. English settlers arrived in the colony of Carolina in 1670 and established a town at Albemarle Point on the west bank of the Ashley River.
Both Beaufort County and its county seat Beaufort were named for Henry Somerset, Duke of Beaufort (1684-1714), one of the Lords Proprietors of Carolina.
Spartanburg County and its county seat, the city of Spartanburg, were named for the Spartan Regiment, a local militia unit that fought in the Revolutionary War.