Statue of the Duchess of Luxembourg, Old Town, UNESCO World Heritage Site, Luxembourg City, Grand Duchy of Luxembourg, Europe

The Duchess Lake, Lazio, Italy, Europe

Prince William kisses his new wife Catherine Duchess of Cambridge during their public appearance on the balcony of Buckingham Palace, on their wedding day, London, England, United Kingdom, Europe

White marble tombs of Duke and Duchess of Argyll, George Douglas VIII eighth Duke and wife Ina, inside Iona Abbey, Isle of Iona, Inner Hebrides and Western Isles, Scotland, United Kingdom, Europe

Russian Orthodox Chapel, built 1860 to 1862 for Grand Duchess Maria Palovna, in Weimar, Thuringia, Germany, Europe

Chateau of Duchess Anne, Dinan, Brittany, France, Europe

The Duchess of Cornwall, the Duchess of Cambridge and Prince Harry, Trooping the Colour 2012, The Queen's Birthday Parade, Whitehall, London, England, United Kingdom, Europe

Bookshelves in the Kubus hall, study center of the Duchess Anna Amalia Library in Weimar, Thuringia, Germany, Europe

Bookshelves in the Kubus hall, study center of the Duchess Anna Amalia Library in Weimar, Thuringia, Germany, Europe

Duchess Anna Amalia Library in Weimar, Thuringia, Germany, Europe, PublicGround

Close-up of a Duchess of Oldenburg Apple (Malus domestica) hanging on an apple tree, which grow widely in the Pacific Northwest; Astoria, Oregon, United States of America

England, Berkshire, Windsor, The Duchess of Cambridge pub re-named in 2011 was the first to be named after the newly married Kate.

England, Berkshire, Windsor, The Duchess of Cambridge pub re-named in 2011 was the first to be named after the newly married Kate.

England, Berkshire, Windsor, The Duchess of Cambridge pub re-named in 2011 was the first to be named after the newly married Kate.