Sebestyén, Archbishop of Esztergom was a Hungarian Benedictine monk and prelate who served as the archbishop of Esztergom from 1002 to 1007. Born around 950, he was a missionary and politician within the Kingdom of Hungary. Some historical accounts suggest he may have been the monk Radla, a contemporary and mentor to Saint Adalbert of Prague, who worked alongside him at the court of Grand Prince Géza starting in 995.