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Christus Dominus is the Vatican II Decree on the Pastoral Office of Bishops. It was approved by a vote of 2,319 to 2 of the bishops assembled and was promulgated by Pope Paul VI on October 28, 1965.
In these days especially bishops frequently are unable to fulfill their office effectively and fruitfully unless they develop a common effort involving constant growth in harmony and closeness of ties with other bishops. Episcopal conferences already established in many nations-have furnished outstanding proofs of a more fruitful apostolate. Therefore, this sacred synod considers it to be supremely fitting that everywhere bishops belonging to the same nation or region form an association which would meet at fixed times. Thus, when the insights of prudence and experience have been shared and views exchanged, there will emerge a holy union of energies in the service of the common good of the churches. (CD 37)
The text in English is available on the Vatican web site at: http://www.vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_decree_19651028_christus-dominus_en.html