Ancestry of Richard Plantagenet & Cecily de Neville @ Chart 1841, p 400, Zabum in Sumer, Dioscuri & Cabiri in Greece), no mother
The cited information was published by published by author, 1978 (Ref: Chart 1841, p 400, Zabum in Sumer, Dioscuri & Cabiri in Greece), no mother) The author/originator was Ernst-Friedrich Kraentzler.