“Ignorantia…. Divided in the civil law, into ignorantia facti (ignorance of fact) and ignorantia juris (ignorance of law). Lord Coke accepts this division….” 2 Alexander M. Burrill, A Law Dictionary and Glossary 40 (2d ed. 1867).
ignorantia
ignorantia (ig-n[schwa]-ran-shee-[schwa]). [Latin] Ignorance; esp., ignorance of the law.