International law recognizes four ranks of diplomats:
Ambassadors.
Envoys.
Ministers.
Charge d’affaires.

What are the Classification of Diplomats

It specifies three classes of heads of mission: (1) ambassadors or nuncios accredited to heads of state and other heads of missions of equivalent rank, (2) envoys, ministers, and internuncios accredited to heads of state, and (3) chargés d’affaires accredited to ministers of foreign affairs.

What are the Key Elements of the Diplomatic Law

A fundamental concept of diplomatic law is that of diplomatic immunity, which derives from state immunity. Key elements of diplomatic law are the immunity of diplomatic staff, the inviolability of the diplomatic mission and its grounds, and the security of diplomatic correspondence and diplomatic bags.

What is the First Rule of Diplomacy as Per Law

The first principle, stated Powell, is that “power is a necessary condition for foreign policy success, but not always a sufficient one.” Power is necessary because it is not possible to reason with every adversary that threatens a vital interest.