Konstancia of Hungary: Cawley, Charles. Medieval Lands: A Prosopography of Medieval European Noble and Royal Families. Hungary Kings, A. Origins. Accessed August 2018<.
WikiTree profile UNKNOWN-78822 created through the import of FAMILY 6162011.GED on Jun 20, 2011 by Michael Stephenson.
Pedigree Resource File CD 49 Publication: (Salt Lake City, UT: Intellectual Reserve, Inc., 2002)
Ancestral File (TM) Author: The Church of Jesus Christ of Latter-day SAINTS Publication: June 1998 (c), data as of 5 JAN 1998
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