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Yvelines was created from the western part of the defunct department of Seine-et-Oise on 1 January 1968 in accordance with a law passed on 10 January 1964 and a décret d'application (a decree specifying how a law should be enforced) from 26 February 1965.
The departmental capital, Versailles, which grew up around Louis XIV's château, was also the Frenchcapital for more than a century under the Ancien Régime and again between 1871 and 1879 during the early years of the Third Republic. Since then the château has continued to welcome the parlement when called upon to sit in a congressional sitting, jointly with the upper house in order to enact constitutional changes or, as happened most recently in June 2009, to listen to a formal declaration by the president.
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