exist. The last member sitting on a European throne was Frederica of Hanover, Queen of Greece († 1981), mother of Queen Sofia of Spain and King Constantine II of Greece. Frederica's brother Prince George William of Hanover married Princess Sophie of Greece and Denmark, sister of Prince Philip, Duke of Edinburgh. The House's head is Queen Frederica's nephew Ernst August, the third and present husband of Princess Caroline of Monaco. Rulers of the House of Welf House of Welf Partitions under Welf rule Table of rulers Family trees Welf family tree 12th century Welf family tree 18th century to present Some direct ancestors (fathers and sons) of the present generation are: Ernest Augustus, King of Hanover (1771–1851) George V of Hanover (1819-1878) Ernest Augustus, Crown Prince of Hanover (1845-1923) Ernest Augustus, Duke of Brunswick (1887-1953) Ernest Augustus, Prince of Hanover (1914-1987) Ernest Augustus, Prince of Hanover (1954-) See also Guelph Treasure Family tree of the German monarchs Guelph, Ontario References External links Die Welfen. Official site Succession laws in the House of Welf Welf Welf