Europèaische Stammtafeln (Isenburg edition) @ Band II table 70, no parents, Thyra "Danebod"
The cited information was published by Verlag von J.A. Stargardt, Marburg, Germany, 1953, 1975 (Ref: Band II table 70, no parents, Thyra "Danebod") The author/originator was Prince Wilhelm Karl von Isenburg.