Justus, a prominent figure in the early Christian church, was sent by Pope Gregory the Great from Italy to England with a mission to convert the Anglo-Saxons from their pagan beliefs. His arrival in England likely coincided with the second wave of missionaries dispatched in the year six hundred and one.
In six hundred and four, Justus became the first bishop of Rochester, where he played a pivotal role in urging the Irish bishops to adopt the Roman method for calculating the date of Easter. His commitment to unifying the Christian faith was evident when he attended a church council in Paris in six hundred and fourteen.
Following the death of King Æthelberht of Kent in six hundred and sixteen, Justus faced challenges that forced him to flee to Gaul. However, he was reinstated in his diocese the following year, demonstrating his resilience and dedication to his mission.
In six hundred and twenty-four, Justus was elevated to the esteemed position of Archbishop of Canterbury. In this role, he oversaw the dispatch of missionaries to Northumbria, furthering the spread of Christianity in England. After his passing, he was venerated as a saint, and his remains were translated to a shrine in St Augustine's Abbey, Canterbury, in the one thousand ninety's.