Peter II (French: Pierron; Italian: Pietrone; Latin: Petronius) (died 1081) was the third Italo-Norman count of Trani.
In 1057 he began receiving those Normans disaffected by the rise of Robert Guiscard after the death of Count Humphrey, whose young sons, Abelard and Herman, were pushed aside.
In 1077 a local presbyter, Maraldus, donated a house to the church of San Eustachio in Corato in the presence of Erberto, Goffredo, and Guarino, who witnessed the charter as "faithful vassals" (fideles) of the imperialis vestis et comitis normannorum (imperial vestes and count of the Normans).
In the ensuing war—which Amatus places before Guiscard's return from Sicily and which William dates to after his return—Peter, with Abelard's brother Herman, took the duke's castles in Apulia and ravaged his lands, collecting a large booty.
When Richard left Canne for Capua, Guiscard marched on his cities, taking Andria after a brief siege and forcing the surrender of Cisterna, where he had Peter tied to a timber screen and exposed so that the defenders, who were his vassals, could not counterattack without injuring or killing him.
[4] The king was ransomed for a large sum by the Bishop of Cres and died shortly thereafter, being buried in the church of Saint Stephen in the fortress of Klis.
Guiscard left the siege of the place under the watch of his wife, Sichelgaita, with some Bariot reinforcements, and himself besieged Taranto, which Peter had been ruling for his nephew, by land and sea.