Exactly when Mellitus and his party arrived in England is unknown, but he was certainly in the country by 604, in the province of the
East Saxons, making Mellitus the first Bishop of London after the Roman departure (London was the East Saxons' capital). The city was a logical choice for a new bishopric, as it was a hub for the southern road network. It was also a former Roman town; many of the Gregorian mission's efforts were centred in such locations. Before his consecration, Mellitus baptised Sæberht, Æthelberht's nephew, who then allowed the bishopric to be established. Æthelberht, rather than Sæberht, probably founded the episcopal church built in London. Although Bede records that Æthelberht gave lands to support the new episcopate, a charter that claims to be a grant of lands from Æthelberht to Mellitus is a later forgery. Boniface had Mellitus take two papal letters back to England, one to Æthelbert and his people, and another to
Laurence, the Archbishop of Canterbury. He also brought back the synod's decrees to England. No authentic letters or documents from this synod remain, although some were forged in the 1060s and 1070s at Canterbury. Both Æthelberht and Sæberht died around 616 or 618, causing a crisis for the mission. Bede says that Mellitus was exiled because he refused the brothers' request for a taste of the
sacramental bread. The historian N. J. Higham connects the timing of this episode with a change in the "overkingship" from the Christian Kentish Æthelberht to the pagan East Anglian
Raedwald, which Higham feels happened after Æthelberht's death. In Higham's view, Sæberht's sons drove Mellitus from London because they had passed from Kentish overlordship to East Anglian, and thus no longer needed to keep Mellitus, who was connected with the Kentish kingdom, in office. Mellitus fled first to Canterbury, but Æthelberht's successor
Eadbald was also a pagan, so Mellitus, accompanied by Justus, took refuge in Gaul. because the East Saxons remained pagan. The East Saxon see was not occupied again until
Cedd was consecrated as bishop in about 654. ==Archbishop and death==