sentences:  These types, each well represented by numerous Roman copies and heads, are identified with three of Pliny's five sculptors; a type derived from Phradmon has not been identified.Of these, however, only the identification of the Mattei type as deriving from Phidias's original is undisputed.The assignment of the Sciarra-type as deriving from Polyclitus's original and Sosicles-type as deriving from Kresilas's original (or vice versa), on the other hand, is unestablished, although having been discussed since 1897.