and the extent of Ælle's actual power in southern England is an open question. It is also noteworthy that there is a long gap between Ælle and the second king on Bede's list, Ceawlin of Wessex, whose reign began in the late 6th century; this may indicate a period in which Anglo-Saxon dominance was interrupted in some way. Earlier sources than Bede exist which mention the South Saxons, though they do not name Ælle. The earliest reference is still quite late, however, at about 692: a charter of King Nothhelm's, which styles him "King of the South Saxons". Charters are documents which granted land to followers or to churchmen, and which would be witnessed by the kings who had power to grant the land. They are one of the key documentary sources for Anglo-Saxon history, but no original charters survive from earlier than 679. There are other early writers whose works can shed light on Ælle's time, though they do not mention either him or his kingdom. Gildas's description of the state of Britain in his time is useful for understanding the ebb and flow of the Anglo-Saxon incursions. Procopius, a Byzantine historian, writing not long after Gildas, adds to the meagre sources on population movement by including a chapter on England in one of his works. He records that the peoples of Britain—he names the English, the British, and the Frisians—were so numerous that they were migrating to the kingdom of the Franks in great numbers every year, although this is probably a reference to Britons emigrating to Armorica to escape the Anglo-Saxons. They subsequently gave their name to the area they settled as Brittany, or la petite Bretagne (lit., "little Britain"). Evidence from place names in Sussex The early dates given in the Anglo-Saxon Chronicle for the colonization of Sussex are supported by an analysis of the place names of the region. The strongest evidence comes from place names that end in "-ing", such as Worthing and Angmering. These are known to derive from an earlier form ending in "-ingas". "Hastings" for example, derives from "Hæstingas" which may mean "the followers or dependents of a person named Hæsta", although others suggest the heavily Romanised region may have had names of Gallo-Roman origin derived from "-ienses". From west of Selsey Bill to east of Pevensey can be found the densest concentration of these names anywhere in Britain. There are