This unique publication is a carefully prepared edition of the medieval treatise “De Porta Primordii. Tractatus de Virtute Occulta” – "On the Gates to the Beginning: A Treatise on Hidden Power." Available to the public for the first time, this text unveils the mysteries of ancient esoteric teachings passed down through generations. The publication includes the original Latin manuscript, along with the author’s translations into English and Russian, as well as a private study tracing possible sources and stylistic elements characteristic of the 15th century. This edition will intrigue anyone interested in the history of magic and mystical philosophy of the Middle Ages.