This document is an English translation of an epistle written by Nostradamus and published as a preface to his book of prophecies in 1568. In the epistle, Nostradamus dedicates his book to King Henry II of France and provides context for his prophetic writings. He explains that his prophecies come from natural instincts and astronomical calculations rather than strict rules of poetry. He provides summaries of some predictions covering events up to the year 1606 and beyond.