Ex Facto
A New Law Dictionary and Glossary · Alexander M. Burrill · 1850
A New Law Dictionary and Glossary
Lat. From, by or in consequence of an act, or thing done. Bract. fol.
172.
Applied generally to an act done in violation of law or right. A title is said to originate ex facto, when it commences in an unlawful act. Id. ibid. Bracton uses it in the same sense with de facto, (q. v.) Id. ibid.
Ex facto jus oritur
Law arises out of fact, or is brought into exercise by fact. A rule of law continues in abstraction and theory, until an act is done on which it can attach and assume as it were a body and shape.
Best on Evid. Introd. § 1.
The law arises out of the fact, or is determined or regulated by the fact.
3 Bl. Com. 329.
The decision of the law in a particular case depends upon the fact which is proved or made to appear. Otherwise expressed, ex facto jus oritur.
2 Inst. 49.