Fīat jūstitia ruat cælum is a Latin legal phrase, meaning "Let justice be done though the heavens fall." The maxim signifies the belief that justice must be realized regardless of consequences. According to the 19th-century abolitionist politician Charles Sumner, it does not come from any classical source. It has also been ascribed to Lucius Calpurnius Piso Caesoninus, see . It was used in Somerset v Stewart.