Saints Cyril and Methodius are known as the "apostles of the southern Slavs." Their feast day is February 14. In about 863 they were sent to preach the gospel in Moravia, where they had considerable success, due in part to their knowledge of the Slavonic language. In 879 Pope John VIII confirmed Methodius as archbishop of Pannonia and Moravia, with permission for his clergy to celebrate the liturgy in Slavonic. They were routinely harrassed by German missionaries, particularly Bishop Wiching of Nitra. St Methodius died, probably in Velehrad, Czechoslovakia, in 885. Wiching then drove out his principal followers, who took refuge in Bulgaria.