Mary Tudor came to the throne in 1553, bringing the threat of reprisals against opponents of Catholicism. Within a month Bradford was arrested and imprisoned in the Tower of London. During his time in prison, he continued to write religious works and preach to all who would listen. For a time whilst in the Tower, Bradford was put in a cell with three other reformers, Archbishop Cranmer, Ridley and Latimer. Their time was spent in careful study of the New Testament.