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King Manfredo had one illegitimate child by an unknown mistress:
-http://fmg.ac/Projects/MedLands/SICILY.htm#Manfreddied1266B
7. BEATRICE. The primary source which confirms her parentage and marriage has not yet been identified. 1284.
m RANIERI della Gherardesca Conte di Donoratico, son of --- (-1325).
Il D. aveva sposato in prime nozze una nobildonna, Nidda, imparentata* con il re Giacomo II d'Aragona, citata nel 1309.
*Beatrice Hohenstaufen is Jaime II el Justo, rey de Aragón's aunt.