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Credo (Credo in unum Deum - "I believe in one God…") is the third part of the Latin Mass Ordinary. As a sung or chanted version of the Nicene Creed it is an affirmation of Christian faith. It had appeared in Eastern rites by the sixth century, but was not introduced into the Roman Catholic Mass until 1014. It is by far the longest part of the Mass and most larger (usually later) settings have it separated into two or more movements. (J. S. Bach’s great Mass in B minor has it in nine parts.)