Costanza's birth is estimated to have been between 1230[1][2] and 1233/34.[3] She was the daughter of Emperor Friedrich II and Bianca Lancia.[4][5] In about 1244 she was married to Ioannes III Doukas Vatatzes, the emperor of Nicaea.[6] Following Byzantine custom she took on the name of Anna. She returned to Sicily as a widow but had to flee soon after after the death of her brother Manfredi and took refuge at the court of her niece Constanza von Staufen, the wife of Pero III d'Aragón. She died in 1307 in Valencia.[7]
Sources
↑ Treccani, LANCIA, Bianca, di Aldo Settia - Dizionario Biografico degli Italiani - Volume 63 (2004)
↑ Hans-Wolfgang Bächle: Das Erbe der Hohenstaufen. Schwäbisch Gmünd 2008, pp. 55–58
↑ Rosarius Gregorio, Bibliotheca scriptorum qui res in Sicilia gestas sub Aragonum imperio retulere: Eam uti accessionem ad Historicam bibliothecam Carusii instruxit, Volume 1, Bartholomæi de Neocastro Historia Sicula, Panormi 1791, p. 16
↑ Bekker, I. (ed.) (1835) Georgii Pachymeris De Michaele et Andronico Palaeologis, Corpus Scriptorum Historiæ Byzantinæ (Bonn), Vol I, De Michaele Palaeologo, Liber III, 7, p. 181
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