Ex factis jus oritur
“The law arises from the facts.”
Legal maxim
What does “Ex factis jus oritur” mean?
Ex factis jus oritur translates as “The law arises from the facts.”
Rules grow out of what actually happens; facts on the ground can shape the law.
“Ex factis jus oritur” word by word
| Latin | English | Grammar |
|---|---|---|
| Ex | from, out of | preposition taking the ablative case |
| factis | the facts, the deeds | ablative plural (neuter) of factum, “a deed, a fact”; from the verb facio, “I do, I make” |
| jus | law, right | nominative singular (neuter) of ius (also spelled jus), “law, right”; the subject of the sentence |
| oritur | arises, springs up | third person singular present indicative of orior, “I arise” (a deponent verb: passive form, active meaning) |
How to pronounce “Ex factis jus oritur”
Both pronunciations sound the same here, because the only letters that differ (c before e or i, and v) do not occur in this phrase. In the Church style the j in jus is also a y sound. Stress the first syllable of factis and of oritur.
The story behind it
Word for word the maxim says “from the facts the law arises”. The Latin is modern in form, and its exact origin is unknown, so it is best described as a legal maxim rather than a quotation from a named author.
It is used above all in international law, where it points to the idea that established facts, such as who actually controls a territory, can shape legal rules. Lawyers often set it against the maxim ex iniuria ius non oritur, “law does not arise from injustice”.
The two maxims pull in opposite directions, and arguments over which should prevail recur in disputes about borders, occupation and recognition. For that reason ex factis ius oritur is usually cited as a description of how law develops, not as a moral endorsement.
How to use “Ex factis jus oritur”
It suits a law essay or moot court argument about how rules develop from practice, or a discussion of international law. It works poorly as a feel-good motto, because it is a descriptive principle that is often debated.
- Latin
- Ex factis jus oritur
- English
- The law arises from the facts.
- Source
- Legal maxim
- Era
- Modern Latin
- Theme
- Justice
Common mistakes
- It does not mean that whatever happens is lawful or right. Lawyers set it against ex iniuria ius non oritur, which says a wrong cannot create a right.
- Do not attribute it to a Roman jurist or to Cicero. It is a legal maxim of unknown origin, not a quotation from a named ancient author.
- The spelling jus and ius is the same word: the Latin letter i was written as j in many later texts. Both forms are acceptable, but keep one form consistently.
- Ius is neuter and the verb stays singular. Do not write ex factis iura oriuntur unless you really mean the plural “laws arise”.
Questions about “Ex factis jus oritur”
What does “Ex factis jus oritur” mean literally?
“From the facts the law arises.” The words ex factis mean “from the facts” and jus oritur means “law arises”.
Who said “Ex factis jus oritur”?
No one in particular. It is a legal maxim of unknown origin, mainly used in international law, and it should not be credited to a named author.
How do you pronounce “Ex factis jus oritur”?
In Classical Latin: eks FAK-tees yoos OH-ri-toor. The Church pronunciation sounds the same for this phrase.
What is the opposite of “Ex factis jus oritur”?
It is often set against “Ex iniuria ius non oritur”, meaning “law does not arise from injustice”. The first says facts shape law, the second says wrongs cannot create rights.
More to explore
Translation and grammar checked by Latin Quoter · last reviewed November 2026
One Latin line. Every Monday.
A quote, its translation and the story behind it, free in your inbox.