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Plenipotentiary

Diplomat with full powers

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Through Treaty, Edict and Communication

Diplomats

Before the era of rapid international transport or essentially instantaneous communication (such as telegraphy in the mid-19th century and then radio), diplomatic mission chiefs were granted full (plenipotentiary) powers to represent their government in negotiations with their host nation. Conventionally, any representations made or agreements reached with a plenipotentiary would be recognized and complied with by their government.

Historically, the common generic term for high diplomats of the crown or state was minister. It therefore became customary to style the chiefs of full ranking missions as minister plenipotentiary. This position was roughly equivalent to the modern ambassador, a term that historically was reserved mainly for missions between the great powers and also relating to the city-state of Venice.

Permanent missions at a bilateral level were chiefly limited to relations between large, neighboring or closely allied powers, rarely to the very numerous small principalities, hardly worth the expense. Diplomatic missions were dispatched for specific tasks, such as negotiating a treaty bilaterally, or via a conference of plenipotentiaries, such as the Imperial Diet of the Holy Roman Empire. In such cases, it was normal to send a representative minister empowered to cast votes. For example, in the Treaty of Paris, ending the American Revolution, John Adams, Benjamin Franklin and John Jay were named "minister plenipotentiary of the United States" to the Netherlands, France and Spain, respectively.

By the time of the Vienna Congress (1814–15), which codified diplomatic relations, ambassador had become a common title, and was established as the only class above minister plenipotentiary. It gradually became the standard title for bilateral mission chiefs, as their ranks no longer tended to reflect the importance of the states, which came to be treated as formally equal.

In modern times, heads of state and of government, and more junior ministers and officials, can easily meet or speak with each other personally. Therefore, ambassadors do not require plenipotentiary powers, even though they are designated and accredited as "extraordinary and plenipotentiary".

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