William III of England | George III of the United Kingdom | Joseph Conrad | Henry III of England | George III | Edward III of England | Henry III | Edward III | Tony Conrad | Charles III of Spain | William III | Loudon Wainwright III | WTA Tier III tournaments | Richard III of England | Benigno Aquino III | Pope Alexander III | Star Wars Episode III: Revenge of the Sith | Henry III of France | Gustav III of Sweden | Rietberg | Shalmaneser III | Alexander III of Russia | Albatros D.III | Frederick III | Rainier III, Prince of Monaco | Otto III | Frederick William III of Prussia | Victor Emmanuel III of Italy | III | Frederick III, German Emperor |
In 1277, Otto III concluded a secret alliance with Bishop Conrad III of Osnabrück, Bishop Everhard of Münster and Herford Abbey against the Lords of Lippe.