largely on literary evidence. Several manuscripts of the Historia Brittonum, written c. 830, contain a list of 28 or 33 "civitates", originally used to describe British tribal centres under Roman rule but here translated as Old Welsh () and probably indicating "fortified cities". Among these settlements is . Later, the text states that Ida was the first Anglian king of Bernicia and ruler over Cair Ebrauc. These are generally taken as references to a successor to old Roman Eburacum. This mention has led to speculation about Ebrauc in post-Roman times. Christopher Allen Snyder makes note of the evidence for Eboracum continuing to function, perhaps as a military outpost or the seat of a minor kingdom based on some old territory of the Brigantes. Snyder cites historian and archaeologist Nick Higham in saying that the settlement had declined so much by the end of the Roman period that it was unlikely to have been a significant post-Roman regional centre. Scholar Peter Field suggests that the City of Legions (urbs legionum) mentioned by Gildas in his 6th-century De Excidio et Conquestu Britanniae is a reference to York, rather than Caerleon; if this were the case it could provide some contemporary information about Ebrauc. A Peredur son of Efrawg is the hero of a 12th- or 13th-century Welsh romance; this would have been a variant of Ebrauc along with "Efrawg" or "Efrog", suggesting the city had royal associations in later tradition. What later became parts of the North Riding and City of York were conquered by a Bythonic to early Angle version of Deira, Based around the Derwent. Anglo-Saxon Eoforwic Angles settled in the area in the early 5th century. Cemeteries that are identifiably Anglian date from this period. Cremation cemeteries from the 6th century have been excavated close to York on The Mount and at Heworth; there are, however, few objects from inside the city, and whether York was settled at all at this period remains unclear. The fortress's fate after 400 AD is not clear, it is unlikely to have been a base of Romano-British power in opposition to the Anglians. Flooded area reclamation would not be initiated until the 7th century under Edwin of Northumbria. After Angle settlement of Northern England, York was the Anglo-capital of Deira and one of the capitals when the kingdom united with Bernicia, later known as Northumbria. By the early 7th century, York was an