Vlad the Impaler's father died.
Radu IV the Great ( Radu cel Mare ) was a Voivode ( Prince ) of Wallachia from September 1495 to April 1508 . Vlad the Impaler . Vlad 's father and eldest brother , Mircea , were murdered after John Hunyadi , Regent-Governor of Hungary , invaded Wallachia in 1447 .