Christianization of Kent and the Gregorian Mission (597–700)
Before the Roman mission arrived, Kent already had a small Christian presence because Queen Bertha (a Frankish princess) was Christian and worshipped at St Martin’s Church near Canterbury. This mattered because it helped make Kent a practical starting point for a new missionary effort aimed at the Anglo-Saxons.
In 596, Pope Gregory I (“Gregory the Great”) commissioned a group of missionaries led by Augustine, a monk from Rome, to preach Christianity in Anglo-Saxon England. The mission’s planning included seeking support from Frankish rulers along the route, reflecting how diplomacy and travel networks shaped early medieval missions.
In 597, Augustine and his companions landed in Kent and were received by King Æthelberht. Æthelberht allowed them to settle in Canterbury and use St Martin’s Church for worship, giving the mission a stable base for preaching and baptizing converts.
Around 598, land granted by Æthelberht was used to found a monastery outside Canterbury that later became known as St Augustine’s Abbey. The monastery mattered as a training center for clergy and as a burial place for leaders of the Kentish church, helping the mission become permanent rather than temporary.
Soon after the missionaries’ arrival, King Æthelberht accepted Christianity (the exact date is not securely recorded, but it was before 601). A ruler’s conversion often triggered wider conversion, because it signaled that the new religion was politically acceptable and could be publicly supported.
In 601, Pope Gregory sent additional clergy and resources to strengthen the work in Kent, including figures such as Mellitus and Justus. This reinforcement showed that the mission was becoming a major papal project rather than a small local effort.
In 601, Gregory sent guidance (preserved by later writers) advising that pagan idols be removed but that existing temples could be repurposed as churches, and some local festival customs could be redirected into Christian practice. This approach aimed to reduce resistance by changing religious life step-by-step rather than all at once.
In 604, the mission expanded beyond Canterbury by establishing new bishoprics, including London (under Mellitus) and Rochester (under Justus). Creating multiple bishop seats helped turn early conversions into an organized church with local leadership and clearer lines of authority.
Augustine died on 26 May (the year is commonly given as 604) and was succeeded by Laurence as archbishop of Canterbury. This leadership transition tested whether the mission could survive beyond its founder and continue building institutions in Kent.
King Æthelberht died on 24 February 616, and his son Eadbald initially rejected Christianity. Around the same time, in Essex, the bishop of London (Mellitus) was expelled, showing how fragile early conversion could be when political support changed.
After a period of resistance, Eadbald converted to Christianity (often dated to about 616–617) through the influence of Archbishop Laurence. His conversion helped the Kentish church recover, and it allowed bishops who had fled to return and resume their work.
After Laurence died in 619, Mellitus became archbishop of Canterbury (619–624), followed by other mission leaders such as Justus. The continuation of archbishops from the Gregorian mission showed that Canterbury had become a lasting center for church governance in southern England.
In 664, the Synod of Whitby in Northumbria chose Roman practices for calculating Easter and other customs over traditions associated with Irish (Ionan) Christianity. This decision mattered for Kent’s legacy because it strengthened the wider acceptance of Roman-linked church authority and helped unify practice across English kingdoms.
In 672, Archbishop Theodore of Tarsus convened the Council of Hertford, bringing bishops together for a broad church council in Anglo-Saxon England. Its rules focused on church structure and discipline, helping to create a more unified English church system that built on foundations first laid in Kent.
By around 700, Christianity in Kent had moved from a mission dependent on one king to a durable system with monasteries, bishops, and succession of archbishops centered at Canterbury. This period marks the main outcome of the Gregorian Mission in Kent: a lasting institutional base that influenced the development of Christianity across England.