Ancestry of Richard Plantagenet & Cecily de Neville @ chart 1188, s of Ekbert "One Eye" Count of Ambergau & Frederuna
The cited information was published by published by author, 1978 (Ref: chart 1188, s of Ekbert "One Eye" Count of Ambergau & Frederuna) The author/originator was Ernst-Friedrich Kraentzler.