Res nullius is a term of Roman law meaning "things belonging to no one"; that is, property not yet the object of rights of any specific subject. A person can assume ownership of res nullius simply by taking possession of it (occupatio). However, in ancient Rome, certain…
A guide to Res nullius
Why Res nullius is relevant in U.S. law
Res nullius appears in U.S. legal practice across multiple practice areas. Knowing what it means — and when it applies — can determine the outcome of motions, filings, and negotiations. For non-lawyers, the value of looking up a precise definition is that legal terms often carry meanings that differ from everyday usage; relying on the common meaning can lead to costly missteps.
When and how Res nullius applies
In practice, Res nullius is invoked when parties, judges, or attorneys need to identify the legal status of an issue, the rights of those involved, or the procedural step required next. The definition shown above is sourced from Wikipedia , which is widely cited in U.S. legal practice. Because U.S. law is jurisdictionally layered — federal, state, and sometimes local — the precise application of the term can vary by court, so check the controlling authority for your specific case.