Foedus Cassianum

According to Roman tradition, the Foedus Cassianum (/ˈfiːdəs ˌkæʃiˈeɪnəm/ in English) or the Treaty of Cassius was a treaty which formed an alliance between the Roman Republic and the Latin League in 493 BC after the Battle of Lake Regillus. It ended the war between the Latin League and Rome, placing Rome as equal in power to all of the members of the League combined.

In their first treaty with Carthage, the Romans listed the surrounding countryside as part of its territory, which the Latin League contested, claiming that the said territory actually belonged to them. A war followed, with the result of a victory for the Romans at the Battle of Lake Regillus and conditional surrender soon after.

The treaty was concluded in 493 between Rome and thirty Latin cities as two independent powers. The foedus took its name from Spurius Cassius Viscellinus, who was a consul of the Roman Republic at the time the treaty was signed, and ratified the treaty in Rome on Rome's behalf.

The treaty laid out several terms. Not only did it stipulate that there would be peace between the two parties, the treaty mandated that the Roman and Latin armies would be joined to provide mutual defence from Italic tribes. Another term was that the Latin League and Rome would split all spoils taken in war. Also, the two parties agreed to set up joint colonies in captured territory so that they both might prosper. Finally, it established a community of private rights between citizens of Rome and any Latin city. The treaty, of which a bronze copy survived in the Roman Forum until Cicero's day, was a landmark in the early history of Rome. The original does not survive. A version given by Dionysius of Halicarnassus is

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