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In 1961 the UN Conference on Diplomatic Intercourse and Immunities adopted the Vienna Convention on Diplomatic Relations to replace the 19th-century rules of Vienna and Aix. 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. A chargé d’affaires ad interim is a deputy temporarily acting for an absent head of mission. A fourth class established at Aix-la-Chapelle, that of minister-resident, lapsed in the 20th ...(100 of 16604 words)