Thanet was afterwards one of the first landing-places of the Danes: and its isolated position--for a broad belt of sea then separated the island from the Kentish main--would make it a natural post to be assigned by the Welsh to their doubtful piratical allies.

The inlet was guarded by the great Roman fortress of Rhutupiae: and after the fall of that important stronghold, the English may probably have occupied the principality of East Kent, with its capital of Canterbury.

The walls of Rochester may have held out longer: and the West Kentish kingdom may well have been founded by two successful battles at the passage of the Medway and the Cray.
The legend as to the settlement of Sussex is of much the same sort.

In 477, AElle the Saxon came to Britain also with the suspiciously symmetrical number of three ships.

With him came his three sons, Kymen, Wlencing, and Cissa.