Pacta conventa - Croatia - was created in 13##.

It's Pacta Nuptialis

Which means Wedding Agreement.

pacta sunt sevanda , means in contract law means "the contract has to be respected" whatever the contract agreement is

The Latin phrase for legally binding contract is "pacta sunt servanda".

Pacta sunt servanda is a principle of international law and diplomacy with hold the international treaties but constitutional supremacy is the provision that generate for each countries to manage their law system in different ways.