These names are obviously invented to account for those of three important places in the South-Saxon chieftainship.

The host landed at Kymenes ora, probably Keynor, in the Bill of Selsey, then, as its title imports, a separate island girt round by the tidal sea: their capital and, in days after the Norman conquest, their cathedral was at Cissan-ceaster, the Roman Regnum, now Chichester: while the third name survives in the modern village of Lancing, near Shoreham.
The Saxons at once fought the natives "and offslew many Welsh, and drove some in flight into the wood that is named Andredes-leag," now the Weald of Kent and Sussex.

A little colony thus occupied the western half of the modern county: but the eastern portion still remained in the hands of the Welsh.

For awhile the great Roman fortress of Anderida (now Pevensey) held out against the invaders; until in 491 "AElle and Cissa beset Anderida, and offslew all that were therein; nor was there after even one Briton left alive." All Sussex became a single Saxon kingdom, ringed round by the great forest of the Weald.

Here again the obviously unhistorical character of the main facts throws the utmost doubt upon the nature of the details.