Ignorantia juris non excusat
（重定向自Ignorantia legis neminem excusat）
Ignorantia juris non excusat or ignorantia legis neminem excusat (Latin for "ignorance of the law excuses not" and "ignorance of law excuses no one" respectively) is a legal principle holding that a person who is unaware of a law may not escape liability for violating that law merely because he or she was unaware of its content.