Source: http://webot.org/info/en/?search=Penn%E2%80%93Calvert_Boundary_Dispute
Timestamp: 2019-04-21 16:07:32+00:00

Document:
The Penn–Calvert boundary dispute (also known as Penn vs. Baltimore) was a long-running legal conflict between William Penn and his heirs on one side, and Charles Calvert, 3rd Baron Baltimore and his heirs on the other side. The overlapping nature of their charters of land in Colonial America required numerous attempts at mediation, surveying, and intervention by the king and courts of England to ultimately be resolved. Subsequent questions over these charters have also been adjudicated by American arbitrators and the Supreme Court of the United States. The boundary dispute shaped the eventual borders of five U.S. states: Pennsylvania, Maryland, Delaware, New Jersey, and West Virginia.
Charles Calvert, the 3rd Lord Baltimore, died in 1715, and William Penn died in 1718. Benedict Calvert, 4th Baron Baltimore died just two months after his father, so the boundary dispute was carried forth by Charles Calvert, 5th Baron Baltimore on Maryland's side, and by Penn's children John, Thomas, and Richard on the Pennsylvania side.
The cupola of the New Castle Court House was used as the center of the Twelve Mile Circle. The boundary Commissions met here numerous times over the years.
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