IGNORANTIA LEGIS NON EXCUSAT by Law Professor Latin maxim meaning ignorance of the law is not an excuse. Related Posts:IGNORANTIA FACTI EXCUSAT IGNORANTIA JURIS NON EXCUSATIGNORANCE OF THE LAWIMPOTENTIA EXCUSAT LEGEMINJURIA NON EXCUSAT INJURIAMRATIO EST LEGIS ANIMA MUTATA LEGIS RATIONE MUTATUR ET LEXIGNORANTIA