Tractate “On the holy spirit” by Saint Ambrose of Milan

The article contains information about the composition of St. Ambrose of Milan “On the Holy Spirit” (“De Spiritu Sancto”), written at the request of Emperor Gratian in 381 A.D. Through the prism of triadological doctrines tractate describes the doctrine of the Third Person of the Holy Trinity. The article introduces the first publication of the translation of the first book into Russian.