Historia Regum
The Historia Regum ("History of the Kings") is a historical compilation attributed to Symeon of Durham and Byrhtferth of Ramsey, which presents material going from the death of Bede until 1129. It survives only in one manuscript compiled in Yorkshire in the mid-to-late 12th century, though the material is earlier. It is an often-used source for medieval English and Northumbrian history.