Dattus

Dattus (or Datto) was a Lombard leader from Bari, the brother-in-law of Melus of Bari. He joined his brother-in-law in a 1009 revolt against Byzantine authority in southern Italy.

In 1010, the rebels took Ascoli and Troia. In March 1011, the catepan Basil Mesardonites and Leo Tornikios Kontoleon, the strategos of Cephalonia, disembarked with reinforcements from Constantinople. Basil immediately besieged the rebels in Bari. The Greek citizens of the city negotiated with Basil and forced the Lombard leaders, Melus and Dattus, to flee. Basil entered the city on 11 June 1011 and reestablished Byzantine authority. He did not follow his victory up with any severe reactions. He simply sent the family of Melus, including his son Argyrus, to Constantinople.