(this is the famous portrait by Hans Holbein of the great humanist scholar)
Desiderius Erasmus (1466-1536) of Rotterdam was anything but irascible. He was mild-mannered, loyal to his Catholic Church to the end of his life, and kept his distance from the likes of Luther. He remains important to us today especially because of his Greek NT (1515 first ed. 1522 2nd ed.), which became the main basis other than earlier English translations such as Tyndale’s for the King James translation.
Erasmus accepted Revelation as canonical, despite doubts expressed even by some of the Reformers, and so of course he needed to provide a Greek text of the book for his Greek NT. The problem was, his only copy of a Greek manuscript was missing the very end of the book! The story goes that he pulled out his Latin Vulgate of Jerome, and retro-translated from the Latin back into the Greek the missing six verses. His Greek frankly was better than the Greek of John of Patmos, and as we now know, matched exactly no ancient Greek manuscript of the book.
This might not be of much more than historical import except that the King James Version of the book was based on Erasmus’ Greek translation to a very great extent (see J. Krans, “Erasmus and the Text of Revelation 22.19,” TC: A Journal of Biblical Text Criticism (2011), pp. 1ff.). Here is yet one more reason why no one today should be following the text of the KJV if one really is committed to the principle of ‘text determines canon’ by which I mean, the earliest and best Greek text we can produce should be the basis of any good translation into English.