The book examines documentary evidence from various authors and proves that for centuries there has existed, and perhaps still exists today, an international secret organization, the Etruscan Brotherhood, whose members united around the idea of preserving and passing on to future generations the secret knowledge of the priests of Ancient Egypt. The author discovered his mathematical method for determining the time of origin of past and future events according to Nostradamus, analyzed the cosmic construction ideas of Ancient Egypt, built three versions of the calendar according to Dante, etc. The book will be of interest to everyone who wants to find out the dependence of the events of their lives and world cataclysms on predictions and prophecies of times distant from today.