Ius Strictum Law and Legal Definition

Ius strictum is a Latin phrase which means “strict law”. It also means law interpreted without any modification law interpreted and in its utmost rigor. It is a very rare term used in the materials of classical Roman law.

This is really a Byzantine term seen in Justinian’s Institutes in reference to the strict actions of the law, primarily describing the rigid limitations of the forms of action available under the law, particularly the older laws. This was used by later commentators to distinguish it from the moderating influence of judges who expanded the law through actions equity.