within Dutch Catholic dioceses" were reported to have occurred since 1945. A planned visit of Pope Francis to the Netherlands was blocked by Cardinal Wim Eijk in 2014, allegedly because of the feared lack of interest for the Pope among the Dutch public. History Medieval period From the 4th to the 6th century AD The Great Migration took place, in which the small Celtic-Germanic-Roman tribes in the Low Countries were gradually supplanted by three major Germanic tribes: the Franks, the Frisians and Saxons. The most powerful of these were the Franks (who, at the time, resided between the Rhine and the Somme) and they converted to Catholic Christianity, during the reign of King Clovis I around 500 AD. Most of the region thus fell under the Frankish Kingdom and then the Carolingian Empire until the end of the 9th century. From the center of the Diocese of Tongeren-Maastricht-Liège, successively the cities of Tongeren, Maastricht and Liège, this part of the Low Countries was probably Christianized. According to tradition, the first Bishop of Maastricht, Servatius, was buried in this city in 384, though only from Bishop Domitianus (ca. 535) is it established that he resided in Maastricht. The coastal Frisian Kingdom remained Germanic pagan but were eventually conquered by Charles Martel and incorporated into the Catholic Frankish Kingdom after the Battle of the Boarn in 734. The Northern parts of the Netherlands were converted as part of the Anglo-Saxon mission as Catholic Christians from the various kingdoms of Anglo-Saxon England moved to the Continent, such as St. Willibrord, the Apostle of the Frisians and St. Boniface, who was martyred in Friesland. Both were active in the eighth century, having great impact on the conversion of the country. The areas in the Low Countries which would eventually become part of the modern Netherlands were part of Middle Francia and then Lotharingia, before eventually becoming part of the Holy Roman Empire of the German Nation as part of the Burgundian Netherlands. Originally under the House of Valois-Burgundy by the end of the 15th century it was part of the Habsburg Netherlands as part of a vast Catholic Habsburg Empire dominated by the Kingdom of Spain. Since the rise of Calvinism Since the War of Independence the Catholics were systematically and officially discriminated against by the Protestant government until the second half of the 20th century, which had a major influence on the economical