Pope Sergius I
By the mid-7th century, English and Irish missionaries set out to convert the Frisians. Pope Sergius I appointed their leader, Saint Willibrordus, as bishop of the Frisians. The tenure of Willibrordus is generally considered to be the beginning of the Bishopric of Utrecht. In 723, the Frankish leader Charles Martel bestowed the fortress in Utrecht and the surrounding lands as the base of the bishops. From then on Utrecht became one of the most influential seats of power for the Roman Catholic Church in the Netherlands.