Florence of Worcester, Chronicon ex chronicis, p. 264: Identifies Cyneswitha as the wife of Penda and their five sons as Peada, Wulfhere, Æthelred, Merewald, and Mercelmus, and their two daughters as Cyneburgh and Cyneswitha.
William of Malmesbury's Chronicle of the kings of England from the earliest period to the reign of King Stephen; p. 71; "Penda increased the number of infernal spirits. By his queen Kyneswith his sons were Peada, Wulfhere, Ethelred, Merwal, and Mercelin: his daughters, Kyneburg, and Kyneswith"
Damian Tyler, 'An Early Mercian Hegemony: Penda and Overkingship in the Seventh Century', Midland History, 30:1 (2005), 1–19 doi:10.1179/mdh.2005.30.1.1.
fordham.edu
Manuscript A of the Anglo-Saxon Chronicle gives the year as 655. Bede also gives the year as 655 and specifies a date, 15 November. R. L. Poole (Studies in Chronology and History, 1934) put forward the theory that Bede began his year in September, and consequently November 655 would actually fall in 654; Frank Stenton also dated events accordingly in his Anglo-Saxon England (1943).1 Others have accepted Bede's given dates as meaning what they appear to mean, considering Bede's year to have begun on 25 December or 1 January (see S. Wood, 1983: "Bede's Northumbrian dates again"). The historian D. P. Kirby suggested the year 656 as a possibility, alongside 655, in case the dates given by Bede are off by one year (see Kirby's "Bede and Northumbrian Chronology", 1963). The Annales Cambriae gives the year as 657. Annales Cambriae at Fordham University
