The Ottoman Sultan, Murad II, summoned Vlad Dracul to Edirne to do homage to him in March 1442.[3] Before leaving Wallachia, Vlad Dracul appointed Mircea to rule Wallachia during his absence.[3] The sultan accused Vlad Dracul of treachery and ordered his imprisonment.[3] He also sent a troop of 12,000 strong to invade Wallachia.[3][4]