Pope Sergius I
The exact history of first church building is not known but it was possibly built and its presence was definitely established by 724. It was established by Willibrord, after he had received his mission from Pope Sergius I. The patron saint of the church, Salvator, is a possible reference to the Basilica of St. John Lateran, the ecclesiastical seat of the Pope and the mother church of the Catholic Church, as this church was at first also dedicated to St. Salvator. The name Salvator means "savior" and is a direct reference to Jesus the Savior.