Sgraffito technique as evidence of history and provenance No.2

[Searcher]

Searcher - 

the fifteenth century is rather later than we usually date the advent of eastern influence on Latin works.  The effects are seen from the late twelfth century in some areas, and some media but the usual dates are given as 1258-1350, by which time it is not at all uncommon.

I didn't mean advent, but prevalence.