"Castro"
(in Italian) is derived from the Latin "castrum," a second declension neuter case noun (plural = "castra").
The ancient 'castrum'
was "a fortified military encampment, normally constructed on a
square plan":
.
.
'Castra' were established by Julius Caesar throughout the Roman Empire.
"Castro" has been Anglicized as "Chester"; the form appears in English city names that recall the 'castra' built at
places such as Winchester, Manchester, etc.
Hence in English,
"Castronuovo" may be rendered correctly as "Newchester."
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A VISIT TO THE TOWN OF CASTRONUOVO DI SANT'ANDREA
BASILICATA, SOUTHERN
ITALY: