Sussex, Kent, East Anglia and part of Yorkshire; while the West Saxons founded a kingdom in Hampshire under Cerdic, around 520. Kent At the end of the 6th century the most powerful ruler in mongst the Anglo-Saxon kingdoms was Æthelberht of Kent, whose lands extended north to the River Humber. He married a Frankish princess, Bertha of Paris, daughter of Charibert I and his wife Ingoberga. There were strong trade connections between Kent and the Franks. The marriage was agreed to on the condition that she be allowed to practice her religion. She brought her chaplain, Liudhard, with her. A former Roman church was restored for Bertha just outside the City of Canterbury. Dedicated to Saint Martin of Tours, it served as her private chapel. Gregorian mission In 595, Pope Gregory I dispatched Augustine, prior of Gregory's own monastery of St Andrew in Rome, to head the mission to Kent. Augustine arrived on the Isle of Thanet in 597 and established his base at the main town of Canterbury. Æthelberht converted to Christianity sometime before 601; other conversions then followed. The following year, hey established the Monastery of SS. Peter and Paul. After Augustine's death in 604, the monastery was named for him and eventually became a missionary school. Through the influence of Æthelberht, his nephew Sæberht of Essex also converted, as did Rædwald of East Anglia, although Rædwald also retained an altar to the old gods. In 601 Pope Gregory sent additional missioners to assist Augustine. Among them was the monk Mellitus. Gregory wrote the Epistola ad Mellitum advising him that local temples be Christianized and asked Augustine to Christianize pagan practices, so far as possible, into dedication ceremonies or feasts of martyrs in order to ease the transition to Christianity. In 604 Augustine consecrated Mellitus as Bishop of the East Saxons. He established his see at London at a church probably founded by Æthelberht, rather than Sæberht. Another of Augustine's associates was Justus for whom Æthelberht built a church near Rochester, Kent. Upon Augustine's death around 604, he was succeeded as archbishop by Laurence of Canterbury, a member of the original mission. The North After the departure of the Romans, the church in Britain continued in isolation from that on the continent and developed some differences in approach. Their version of tradition is often called "Celtic Christianity". It tended to be more monastic-centered than the Roman, which favored