EN
With broad reference to various sources, the author presents the Cyril and Methodius Slavic Mission and its developments in the contest of the Christianisation of the Slavs and the complicated geopolitics of the Middle Age era. The essay focuses on different phases of the Slavic acculturation process starting with the first translations, including the entire Bible, and original works until to formation of a new cultural memory. The copious early Slavic written production, an overlooked page of European culture history, is considered through the paradigmatic example of Simeon's Miscellany, a collection of texts with the classical tradition of Patristic thought, which intended to offer a series of indispensable tools to understand the Bible and illustrate the traditional doctrine of the Christian East.