Alliata or Agliata is an Italian noble family.

The family claims an ancestor mentioned in an Imperial decretus of 325 AD, during the reign of Roman Emperor Constantine the Great.

When Dacius Alliata died in 552, he was declared a saint by the Chalcedonian Church with a feast day on January 14.

[1] In the 12th century, the family resettled at Pisa and then Palermo, where they accumulated several titles of Prince, including Prince of the Holy Roman Empire, the title of Gentiluomo di camera di Sua Santità, and numerous other titles.

[2] In 1860, one Alfonzo Alliata led a failed mercenary force against Giuseppe Garibaldi's Expedition of the Thousand; Alliata was the sole survivor of his company.