Franks Geoffrey II of Anjou Geoffrey IV of Anjou "~ the Man": John II of Portugal (, a nickname given to him by Isabella of Castile) "~ the Martyr": Edward the Martyr of England King Charles I of England Charles I of Portugal () Nicholas II of Russia "~ the Master of Avis": John I of Portugal (, a reference to his position as Master of the Order of Avis before his election as King) "~ the Memorable": Eric II of Denmark "~ the Merry": Charles II of England "~ the Mild": Halfdan of Romerike and Vestfold "~ the Middle": Pippin of Herstal "~ the Mighty": Stephen Uroš IV Dušan of Serbia "~ Minus-a-Quarter": Michael VII Dukas, Byzantine Emperor "~ Moneybags": Ivan I of Russia "~ the Monk": Alfonso IV of Leon Fortun I of Pamplona Ramiro II of Aragon Vlad IV of Wallachia "~ Monk's-Cloak"?: Jon Kuvlung of Norway "~ Monomakh" (Russian "", from Greek "", "One who fights alone"): Vladimir Monomakh of Kiev "~ Monomakhos" (from Greek "", "One who fights alone"): Constantine IX, Byzantine Emperor "~ the Moor": Ludovico Sforza, Duke of Milan "the Most Beautiful ~": Maria of Portugal, Queen of Castile () "Mother ~": Menelik II of Ethiopia ( imiyē Minīlik "~ the Missed-King": Manuel II of Portugal () "The Mouth": Sigurd II of Norway "~ the Musician-King: John IV of Portugal () Louis I of Portugal () N "~ the Navigator": Henry of Portugal "~ New-Day": Valdemar IV of Denmark "~ of the Nine Hostages" (): Niall Noigíallach "~ the Noble": Charles III of Navarre Magnus I of Norway "~ No-Counsel" or "~ the Unready": Ethelred II of England (; ) "~ the Nun's-Lover" (): John V of Portugal O "The Oath-Taker": Henry III of Reuss (1337–1378) "The Oberhofrichter": Henry of Reuss-Plauen (1271–1303) "The Oceanographer": Albert I, Prince of Monaco Charles I of Portugal (Portuguese: Carlos o oceanógrafo) "~ The Old" (Cat. el Vell, Fr. l'Ancien, le Vieux, Nor. den Gamle, Pol. Stary, Rum. cel Batran, Sp. el Velloso, Swe. den Gamle, Tgl. Matanda): Ache of Luzon (c. 1480–1572) Albert I of Carpi Albert II of Wedenberg-Heiligenberg (1327–1370) Arnulf I, Count of Flanders (also known as "the great" Basarab Laiota, Prince of Wallachia Boso I, Count of La Marche Coel Hen (Welsh for "Coel the Old"; king of the Brittonic "Hen Ogledd" ("Old North"); possibly legendary) Konrad III of Silesia () Dyfnwal Hen (Welsh