Borough, William, 1536–99, British naval officer. A younger brother of Stephen Borough, William accompanied him on early voyages and was himself a captain for the Muscovy Company. As a naval officer he took part in Sir Francis Drake's attack on Cádiz (1587) and also fought against the Spanish Armada (1588). He wrote accounts of his voyages and a treatise on the variation of the compass and compiled several charts.
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