2. Envoys, ministers, or other persons accredited to sovereigns.
3. Ministers resident.
4. Chargés d'affaires.
The first three grades are accredited to the sovereign. The fourth grade, chargés d'affaires, is accredited to the minister of foreign affairs.
The rank of the agent does not necessarily have any relation to the importance of the business which may be intrusted to him. The titles given to the different diplomatic agents, at the present time, are in a general way descriptive, as follows:—
(1) Diplomatic agents of the first class are held to represent the person of the sovereign. Ambassador ordinary usually designates one holding a permanent mission. Ambassador extraordinary designates one on a special mission, or having power to act in exceptional circumstances. This, however, is most often a title of somewhat superior honor giving no other advantage. Papal legates rank, and for practical purposes, are, ambassadors extraordinary, though representing particularly ecclesiastical affairs and the Pope as head of the Church. Legates are chosen from the cardinals and sent to countries recognizing the papal supremacy. Nuncios of the Pope rank as ambassadors ordinary on a permanent mission, and are usually intrusted with power to transact general affairs.[212]
(2) Envoys extraordinary, envoys ordinary, and ministers plenipotentiary have in general the same functions and rank. With these rank the papal internuncio. The general idea is that the agents of the second class do not stand for the person of the sovereign, but for the state.
(3) Ministers resident are regarded as upon a less important mission than the agents of the first or second class. They are frequently sent by the greater powers to the lesser powers.
(4) Chargés d'affaires ceremonially rank below the ministers resident. They are accredited to the minister of foreign affairs, while members of the first three classes are accredited to the sovereign. A chargé d'affaires may perform the functions of the higher grades of agents and has the same general privileges. When a consul is charged with a diplomatic mission he ranks with the chargés d'affaires. Commissioners on various missions are sometimes accorded the same rank; but, as they do not bear the title, commissioners cannot claim the rank of the chargé d'affaires, though in their functions there may be no difference.
There is no rule as to the grade of diplomatic agent which one state shall send to another, though it was formerly held that only states entitled to royal honors could send ambassadors. It is now customary for states to agree among themselves as to the relative rank of their diplomatic agent. Thus the United States by a recent act provided that "whenever the President shall be advised that any foreign government is represented or is about to be represented in the United States by an ambassador, envoy extraordinary, minister plenipotentiary, minister resident, or special, envoy or chargé d'affaires, he is authorized in his discretion to direct that the representative of United States to such government shall bear the same designation. This provision shall in no wise affect the duties, powers, or salary of such representative."[213]