The Law of Nations or the Principles of Natural Law (1758)Emmerich de Vattel Of Nations or Sovereign States§ 1. Of the state, and of sovereignty§ 2. Authority of the body politic over the members.§ 3. Of the several kinds of government.§ 4. What are sovereign states.§ 5. States bound by unequal alliance.§ 6. Or by treaties of protection.§ 7. Of tributary states.§ 8. Of feudatory states.§ 9. Of two states subject to the same prince.§ 10. Of states forming a federal republic.§ 11. Of a state that has passed under the dominion of another.
     1.    Nor shall we examine which of those different kinds of government is the best. It will be sufficient to say in general, that the monarchical form appears preferable to every other, provided the power of the sovereign be limited, and not absolute, — qui tum demum regius est, si intra modestiæ et mediocritatis fines se contineat, excessu potestatis, quam imprudentes in dies augere satagunt, minuitur, penitusque corrumpitur. Nos stulti, majoris, potentiæ specie decepti, dilabimur in contrarium, non satis considerantes cam demum tutam esse potentiam quæ viribus modum imponit. The maxim has both truth and wisdom on its side. The author here quotes the saying of Theopompus, king of Sparta, who, returning to his house amidst the acclamations of the people, after the establishment of the Ephori — "You will leave to your children (said his wife) an authority diminished through your fault." "True," replied the king: "I shall leave them a smaller portion of it; but it will rest upon a firmer basis." The Lacedæmonians, during a certain period, had two chiefs to whom they very improperly gave the title of kings. They were magistrates, who possessed a very limited power, and whom it was not unusual to cite before the tribunal of justice, — to arrest, — to condemn to death, — Sweden acts with less impropriety in continuing to bestow on her chief the title of king, although she has circumscribed his power within very narrow bounds. He shares not his authority with a colleague, — he is hereditary, — and the state has, from time immemorial, borne the title of a kingdom.