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Holy See
The Holy See is the episcopal jurisdiction of the Bishop of Rome - who is always the Pope of the Catholic Church in the Christian religion.
It is the preeminent episcopal jurisdiction of the Catholic Church, forming the central government of the Church. As such, diplomatically, and in other spheres the Holy See acts and speaks for the whole Catholic Church. It is also recognized by other subjects of international law as a sovereign entity, headed by the Pope, with which diplomatic relations can be maintained.
The Holy See is not the same as the Vatican City - this came into existence only in 1929, while the Holy See dates back to early Christian times. Ambassadors are officially accredited not to the Vatican City State but to "the Holy See", and papal representatives to states and international organizations are recognized as representing the Holy See, not the Vatican City State.
However, in terms of Re.ViCa we regard them as close enough to be synonyms. Those of a philosophical turn of mind may wish to meditate on the analogy with the mind and the brain - or the soul and the body - of human beings.
The official web site for the Holy See is http://www.vatican.va/ whereas the official web site for the Vatican City State is http://www.vaticanstate.va/EN/ - though it is confusing that "vatican" is a component of both.