Milano Editrice "La Sogente," Italy, printed at least two books in their Principe Valiant serie.
One in 1955 called "Atilla" (PV fights Atilla the Hunn, original book 2).
And one in 1954 called "Il Principe Coraggioso".
These books are the Hasting House (Max Trell) versions for Italy. I 've never seen other volumes.
These are expensive HC books, value around 100 Euro.
Max trell books