With his father’s premature and sudden death, Charles Calvert inherited the title of Lord Baltimore at only sixteen years of age. In 1721, having reached the age of majority, he assumed control of the colony. The following year, facing financial difficulties, he sold Kiplin Hall,, which was built as a hunting lodge by George Calvert in the early 1620s, to his mother’s second husband, Christopher Crowe.
In 1732, he became the first of the proprietors to visit Maryland in nearly fifty years, to look after his interests in a boundary dispute with William Penn's sons. In an agreement made earlier that year, Cape Henlopen, one of the principal points in defining the northern bounds of the eastern part of the province, was mistakenly shown twenty five miles south of its true position on a map. A resulting lawsuit by the Penns dragged on until 1750 when the lord chief justice decided in favor of the Penns. Under this decision, the Mason and Dixon line was established in 1769 as the boundary between Maryland and Pennsylvania. Through this error and the establishment of a transpeninsular boundary, Charles was responsible for the loss of approximately 1,000 square miles of Maryland to Delaware. He died in England at the age of fifty one.
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