See "archetypal name" for examples of the opposite kind of antonomasia. Trademark erosion, or genericization, is a special case of antonomasia related to trademarks. However, the term "duce" survives as an antonomasia for Benito Mussolini. This is named "San Pietro in Vincoli" "per antonomasia". By antonomasia, the namesake came to define hazelnuts in general.