Complete Peerage, Location: Mid-Continent Library, Independence @ one gen.medieval reader says CP says he was prob son of Sybilla
Corbet & another reader says s. of unknown mistress/concubine
The cited information was published by St. Catherine Press, 29 Great Queen St, Kingsway, W.C., 1959 (Ref: one gen.medieval reader says CP says he was prob son of Sybilla
Corbet & another reader says s. of unknown mistress/concubine) The author/originator was G.E. Cockayne.