Ernst August, Duke of Cumberland (1818-1878) was a German nobleman and a member of the House of Hanover. He was born in Hanover, Germany, and became the Duke of Cumberland after the death of his father, Ernst August, King of Hanover. He was known for his strong support of the monarchy and his involvement in various political matters of his time. Throughout his life, Ernst August held several titles and was involved in the affairs of Great Britain and Germany. He was a prominent figure in the royal family and played a role in the complex relationships between European monarchies during the 19th century.