Perhaps as early as 786 the creation of a Mercian archbishopric was being discussed at Offa's court. A letter to the papacy written by Coenwulf, who succeeded Offa's son Ecgfrith to the Mercian throne, claimed that Offa's motives were his dislike of Jænberht, the Archbishop of Canterbury, and of the men of Kent. At the Council of Chelsea held in 787, Offa secured the creation of an archbishopric for his kingdom centred on the diocese of Lichfield (in modern Staffordshire). Offa may have justified the move by suggesting that Jænberht planned to allow the Frankish king Charlemagne to use a landing site in Kent if the latter decided to invade, although this is only known from a 13th-century writer, Matthew Paris. Another concern was probably that of prestige, as having the main Mercian diocese held by an archbishop rather than a bishop would increase the kingdom's status.