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| | | Type | Year Published |
| Di Dario Guida, Maria Pia | Regine e basilisse sulle rotte dei crociati: Costanza Anna di Hohenstaufen Vatatzes | Book Section | 2002 |
| Jotischky, Andrew | Politics and the Crown in the Kingdom of Jerusalem 1099 - 1187 | Journal Article | 2015 |
| Mayer, Hans Eberhard | Ibelin versus Ibelin: The Struggle for the Regency of Jerusalem 1253-1258 | Journal Article | 1978 |
| Olmos, José María de Francisco, | La Mujer en la Europa del Románico. Asalto al poder monárquico | Journal Article | 2003 |
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