He participated in the siege of Cerami, commanding thirty knights, and in 1072 he also attacked Enna for over six months to prevent the Saracens from sending help to Palermo, that his uncle Roger had conquered.
When the Sicilian conquest was ultimate, Roger was given the title of Grand Count of Sicily, and his lieutenants, including Serlo and Ansgot of Pucheuil [fr], were given some fiefs.
When he was finally killed, his heart was supposedly pulled from his chest and eaten, and his head was sent to the Zirid sultan, Tamim ibn al-Mu'izz.
[2][4][5] John Julius Norwich lets us know that while he was writing his book, "The Normans in the South" (published 1967), a construction firm was demolishing the rock.
[2] Serlo married a daughter of Rudolph, count of Boiano, and his wife Altruda, whose name is unknown.