Nielsen Hayden genealogy

Szabolcs de Vajay, "From Alfonso VII to Alfonso X: The First Two Centuries of the Burgundian Dynasty in Castile and Leon -- A Prosopographical Catalogue in Social Genealogy, 1100-1300." Studies in Genealogy and Family History in Tribute to Charles Evans on the Occasion of His Eightieth Birthday, ed. Lindsay L. Brook. Salt Lake City: Association for the Promotion of Scholarship in Genealogy, 1989.



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