Westmoreland County was created in 1653. The lightly-settled western portion of Northumberland County was established as its own county, with new officials and a new county court.1
At the time, Puritans had displaced Governor William Berkeley during the English Civil War. Despite the change in leadership, the General Assembly continued to facilitate population expansion and land speculation up the Potomac River.
At the same time, Charles II was in exile in France. He granted all of the Northern Neck to key allies to increase their support for restoring him as king, but that was irrelevant to the General Assembly in Virginia. What became known later as the Fairfax Grant later created difficulties in defining who was entitled to issue land grants, but those who inherited the grant's claims never sought to eliminate the county government.
Illinois County, Virginia, existed from 1778-1784
Source: Newberry Library, Atlas of Historical County Boundaries
Westmoreland County was briefly abolished in 1662. The most influential planters captured the head of the Patawomack, and falsely accused Wahanganoche of murder. Governor Berkeley, re-instated in office after the restoration of Charles II, sought to minimize conflicts with Native Americans that would interrupt his lucrative trade in furs. The General Assembly did not desire a military conflict, which would require raising taxes to finance a militia force.
A special committee of the General Assembly examined the charges against Wahanganoche. In the end, he was freed and compensated, while the planters were fined. The punishments limited the number of people qualified to serve on the Westmoreland County Court, so the General Assembly briefly recombined Westmoreland and Northumberland counties:2