The movement towards Christianity began again in the late 6th and 7th centuries, helped by the conversion of the Franks in Northern France, who carried considerable influence in England. Pope Gregory I sent a team of missionaries to convert King Æthelberht of Kent and his household, starting the process of converting Kent. Augustine became the first Archbishop of Canterbury and started to build new churches across the South-East, reusing existing pagan shrines. Oswald and Oswiu, kings of Northumbria, were converted in the 630s and 640s, and the wave of change carried on through the middle of the 7th century across the kingdoms of Mercia, the South Saxons and the Isle of Wight. The process was largely complete by the end of the 7th century, but left a confusing and disparate array of local practices and religious ceremonies. This new Christianity reflected the existing military culture of the Anglo-Saxons: as kings began to convert in the 6th and 7th centuries, conversion began to be used as a justification for war against the remaining pagan kingdoms, for example, while Christian saints were imbued with martial properties.