"Conventional Law"

--- CONTENT ---
The term Conventional Law defines all international contractual rules which are products of agreements between independent sovereign states based on the "principle of respect for promised ones", or as internationally referred to pacta sunt servanda.

In general, these contractual rules contain explicit declarations by the Contracting Parties and are referred to by various names, e.g. treaty, contract, agreement, protocol, regulation, etc. followed by the name of the place and the year of their connotation. (a) Treaties - contracts and (b) Treaties - laws

Conditions - contracts
The main purpose of the Treaties - contracts are most commonly to determine benefits and compensations by mutual compensation, e.g. a State A grants military bases to another B, and the B State offers financial assistance to the A State.
The special characteristic of these conditions is that they are bilateral or oligopolistic conditions where no subsequent accession is permitted. This kind of conditions are not sources of international law.

Conditions - laws
The main purpose of the Treaties - laws are most commonly to lay down regulatory provisions accepted by the Contracting Parties, with a strong manifestive character. They are more commonly codified already existing rules of customs law, such as the Paris Declaration (1856) concerning the sea war rules.
The special feature of these rules is that they are concluded (concluded) between several states and which most commonly contain a accession clause. This type of conditions, contrary to the treaties - contracts are sources of international law.

Notes
The international contractual rules contained in the various treaties shall enter into force following the exchange or deposit of their ratifications by the governments (Boulis), the signatory parties - states.
The International Treaty, characterized almost by all internationalists, including Greeks, as a "specialist law" (lex specialis) is more prevalent than the general Law of Customs.