Ernst August refers to several historical figures, most notably Ernst August, Duke of Cumberland, who was a member of the British royal family and the last reigning Duke of Cumberland and Teviotdale. Born in 1771, he was known for his military service and his role in the politics of the time, particularly in relation to the House of Hanover. Another significant figure is Ernst August, Prince of Hanover, born in 1954, who is the current head of the House of Hanover. He is known for his involvement in various business ventures and his efforts to maintain the family's heritage and connections to European royalty.