A historian in the U.K. has discovered secret notes hidden in the text of England’s first printed bible.

Recent analysis of the Latin Bible, which was published in 1535 by Henry VIII’s printer, has revealed fascinating English annotations made during the 16th-century Reformation. The Reformation was a period of immense upheaval in England, which saw the Church of England break away from the authority of the Catholic Church in Rome.

Housed in the library of Lambeth Palace, which is the official London residence of the Archbishop of Canterbury, the Bible is one of just seven surviving copies.