Late 17th century; earliest use found in John Davies (1625–1693), translator. From hero + -ify, originally after French †heroifier, in later use after e.g. deify.
Definition of heroify in US English:
heroify
verbhɪˈrəʊɪfʌɪ
with objectTo make into or treat as a hero.
Origin
Late 17th century; earliest use found in John Davies (1625–1693), translator. From hero + -ify, originally after French † heroifier, in later use after e.g. deify.