The University of Douai was founded by Philip II of Spain as part of his military build-up against England and was at first identical to the English College there. This college was a refuge and rallying point for English Catholics fleeing the re-establishment of Protestantism after the death of Mary I and the accession of Elizabeth I. Mary had won for herself the popular title "Bloody Mary" for her methods in attempting to reimpose Catholicism on England. Philip II, who had been married to Mary 1554–1558, used the seminarians from Douai openly as agents. They were often in England illegally to establish contacts and maintain a bridgehead, so to speak, for reconversion.