here - Nobility Associations

Mistresses and illegitimate issue
Unknown name, Sicilian Countess. According to Medlands, she was
the first known mistress of Frederick II, by this time King of Sicily. Her exact
parentage is unknown, but the Thomas Tusci Gesta Imperatorum et
Pontificum stated she was a nobili comitissa quo in regno Sicilie erat heres.
Frederick of Pettorana born in Sicily between 1212 and 1213, who fled to
Spain with his wife and children in 1240, but both his children died there at
the age of two and one.
Adelheid (Adelaide) of Urslingen (c. 1184 – c. 1222). Her relationship with
Frederick II took place during the time he stayed in Germany (between 1215
and 1220). According to some sources, she was related to the Hohenburg
family under the name Alayta of Vohburg (it: Alayta di Marano); but the
most accepted theory stated she was the daughter of Conrad of Urslingen,
Count of Assisi and Duke of Spoleto.
Son: Enzio (Heinz) Von Hohenstaufen King Of Sardinia (1215–1272)
Enzo (or Enzio) was an illegitimate son of Emperor
Frederick II, who appointed him King of Sardinia in
1238. He played a major role in the wars between
Guelphs and Ghibellines in northern Italy, and was
captured by his enemies in 1249. He remained
imprisoned in Bologna until his death.
(Picture: King Enzo imprisoned in Bologna, from a medieval
manuscript)
He had a pleasant personality and a strong physical
resemblance to his father. He fought in the wars
between his father, the pope, and the Northern
Italian communes.
When Ubaldo of Gallura died in 1238, the Doria family of Genoa, in order to secure
the Giudicato of Logudoro from Pisan domination, convinced the emperor to marry
Enzo to Ubaldo's widow, Adelasia of Torres. By marrying her, Enzo would accede to
half of the island of Sardinia jure uxoris. He was created a knight in Cremona and
granted the title "King of Sardinia". He travelled to the island to marry Adelasia in
October that year.
The Hohenstaufen Dynasty - Page 61 of 200