In 1525, William Tyndale, an English contemporary of Martin Luther, undertook a translation of the New Testament. Tyndale's translation was the first "printed" Bible in English. Over the next ten years, Tyndale revised his New Testament in the light of rapidly advancing biblical scholarship, and embarked on a translation of the Old Testament. Despite some controversial translation choices, and in spite of Tyndale's execution on charges of heresy for having made the translated Bible, the merits of Tyndale's work and prose style made his translation the ultimate basis for all subsequent renditions into Early Modern English. With these translations lightly edited and adapted by Myles Coverdale, in 1539, Tyndale's New Testament and his incomplete work on the Old Testament became the basis for the Great Bible. This was the first "authorised version" issued by the Church of England during the reign of King Henry VIII. When Mary I succeeded to the throne in 1553, she returned the Church of England to the communion of the Roman Catholic faith and many English religious reformers fled the country, some establishing an English-speaking colony at Geneva. Under the leadership of John Calvin, Geneva became the chief international centre of Reformed Protestantism and Latin biblical scholarship.