Beatrice della Gherardesca, Nidda

• NOT her step-sister Beatrix Hohenstaufen, di Sicilia

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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.

• https://www.treccani.it/enciclopedia/ranieri-della-gherardesca_(Diz...

*Beatrice Hohenstaufen is Jaime II el Justo, rey de Aragón's aunt.

*https://www.geni.com/path/Jaime-II-el-Justo-rey-de-Arag%C3%B3n+is+related+to+Beatrice-della-Gherardesca-Nidda?from=6000000001599527098&path_type=blood&to=6000000089482028046