Who knows? He might have been blonde-haired for all we know, after all the Duchy of Spoleto set up by the Lombards was also located in Central Italy. You can get an idea of that past Lombard presence from this map [1]: " Percentage of Blond Hair in the Italian regions" (notice the green blob East of Naples), which, granted, it may not be 100% scientific but I reckon that it is at least based on some real data.

Later edit: Apparently that map is based on this mid-19th century data sample: Percentages of blond hair in the Italian regions (including Corsica). Data collected by Ridolfo Livi on 1859-1863 lever classes ( "Renato Biasutti - Races and peoples of the Earth - UTET, 1941")

[1] https://old.reddit.com/r/MapPorn/comments/62yyuz/percentage_...