This is a great question. The Catholic Bible includes the Apocryphal books. These are books written primarily during the 400 silent years between the closing of the Old Testament and the coming of Christ. The early church did not consider them part of the Bible. They officially became part of the Catholic Bible in 1546 when the Roman Catholic Church voted, at the Council of Trent, to include them as Scripture. For the 1,500 years before this, they were not regarded, by the church, as Scripture.
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