Excellent as Gregory's scheme would have been had Britain still been under Roman rule, it was unsuited to a country divided as England then was into several rival kingdoms. London did not become a metropolitan see, probably because AEthelberht was unwilling that the seat of ecclesiastical authority should be transferred from his own kingdom to the chief city of a dependent people, while Augustin had no wish that the church which he had founded at Canterbury, and the second monastery, now called after him, which he had begun to build there for a burying-place for himself and his successors, should be reduced to a lower rank. Other Roman clergy had been sent by Gregory to reinforce the mission, and of these Augustin consecrated Mellitus to be bishop of London, Justus to be bishop over Kent west of the Medway, with Rochester as the city of his see, an arrangement that marks an early tribal distinction, and Laurentius to be his own successor at Canterbury. Thus the metropolitan see remained with Kent. More generally, Gregory's scheme failed because it was founded on the old division of Britain as a province of the Roman empire, and was not adapted to the tribal distinctions of the English. Moreover, political circumstances determined the development of the Church; for the Roman mission received a series of checks, and the work of evangelization was taken up by Scottish missionaries. The kingdoms into which the country was divided were finally converted by efforts more or less independent of the Kentish mission; the work of evangelization followed tribal lines, and for sixty years after Augustin's death the tendency of the Church was towards disunion. [Sidenote: Foundation and overthrow of the see of York, 627-633.]