Michael I of Wallachia
... that Michael I of Wallachia was still the co-ruler with his father Mircea I when in 1417 he refused to send the tribute that Mircea had promised to pay to the Ottoman Empire?
... that <b id="mwAkc"><a href="./Michael_I_of_Wallachia" id="mwAkg" rel="mw:WikiLink" title="Michael I of Wallachia">Michael I of Wallachia</a></b> was still the co-ruler with his father <a class="mw-redirect" href="./Mircea_I_of_Wallachia" id="mwAkk" rel="mw:WikiLink" title="Mircea I of Wallachia">Mircea I</a> when in 1417 he refused to send the tribute that Mircea had promised to pay to the <a href="./Ottoman_Empire" id="mwAko" rel="mw:WikiLink" title="Ottoman Empire">Ottoman Empire</a>?