The era pre-dates the emergence of some forms of writing accepted today; notably rare were lower case characters, and the letters W and U. W was occasionally rendered VV (later UU), but the runic character wynn (Ƿ or ƿ) was a common way of writing the /w/ sound.
The early Engle restricted the use of runes to monuments, whereas the Saxons adopted wynn and thorn for sounds which did not have a Latin equivalent.
The chart shows their (claimed) descent from the traditional first king of Wessex, Cerdic, down to the children of Alfred the Great.
These sources are all closely related and were compiled at a similar date, and incorporate a desire in their writers to associate the royal household with the authority of being a continuation of a unified line of kingship descended from a single original founder.
[2] One apparently earlier pedigree survives, which traces the ancestry of King Ine back to Cerdic.