Sir Alexander de Cokburne (b. c1310, d. c1370) was born into a minor aristocratic family in the Scottish Borders. Through his two marriages, Sir Alexander amassed considerable wealth and power in the Lowland Scottish counties of Berwickshire, West Lothian, East Lothian and Peeblesshire. For the five centuries following Sir Alexander, the Cockburn family was, through its significant landholdings and political connections, an influential force in Scottish affairs.