vocatio in jus

Vocatio in jus was a crucial step in Roman legal procedure, particularly during the early stages of the legal system. It involved the plaintiff publicly summoning the defendant to appear in court. If the defendant refused, they could be physically compelled to attend. This initial phase was highly formalized, with strict adherence to specific words and actions. A mistake could result in the plaintiff losing their case.

The legal proceedings were divided into two parts. The first was before a magistrate, who determined if a legal issue existed and defined it. The second part involved a judex, a layman chosen by the parties, who heard evidence and made a decision. However, the judex had no power to enforce their ruling. If the defendant did not comply, they could be forced to pay or even enslaved to the plaintiff to work off the debt. Later developments, like the formulary system and cognitio extraordinaria, shifted more power to magistrates and the state, leading to a more centralized and enforceable system of justice.12