So you would agree to the use of “Italian” in application to a medieval heretic, but not to a medieval saint?
Genoese...Bolognese... Sicilian...ravenna...Paduan...etc. those terms make sense when describing those inhabiting these regions/City states of the Italian peninusla in that time.
Most “journalists” don’t know these things.
But once again gently...Saint Rosa is a Christian saint born in Vitervo. Describing her “Italian” makes almost as much sense as calling Saint Nicholas a Turk (gasp). Ethnicity makes little sense when discussing Christinity.