Category:William I of Sicily

**William I of Sicily**
	12th-century king of Sicily
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Date of birth	1120; Palermo
Date of death	7 May 1166; Palermo
Cause of death	dysentery;
Place of burial	Palermo Cathedral; Cattedrale di Monreale; Tomb of William I of Sicily;
Country of citizenship	Kingdom of Sicily;
Occupation	sovereign;
Field of work	state administration; politics;
Family	Hauteville family;
Father	Roger II of Sicily;
Mother	Elvira of Leon;
Sibling	Costanza I of Sicily; Tancred, Prince of Bari; Roger III, Duke of Apulia; Tancred, King of Sicily; Alfonso of Hauteville; Simon, Prince of Taranto;
Child	William II of Sicily; Roger IV, Duke of Apulia; Robert III, Prince of Capua; Henry, Prince of Capua; Matina di Sicilia;
Spouse	Margaret of Navarre (1150–);
Work location	Sicily;
Authority file
	Q367415; ISNI: 0000000387168879; VIAF ID: 280058705; GND ID: 119430800; Library of Congress authority ID: n86143321; IdRef ID: 030871417; NL CR AUT ID: mzk20231186762; PLWABN ID: 9810621622105606; J9U ID: 987007270079305171
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English: William I (b. 1131 - d. May 7, 1166), called the Bad or the Wicked, was the second king of Sicily, ruling from his father's death in 1154 to his own. He was the fourth son of Roger II of Sicily and Elvira of Castile. His maternal grandparents were Alfonso VI of Castile and a concubine (perhaps wife) baptised Isabella, but born Zaida.