 While there is no historical evidence that Basil of Caesarea was the author of the older Egyptian version, he visited as laymen Egypt in 356-7, and it is therefore possible that there he entered in contact with Egyptian texts which he later modified, tuning the liturgical structure and enforcing a more developed theological structure, so givining origin to the other Basilian versions.A certain reference to a liturgical text which went under the name of Saint Basil is given in a letter of Peter the Deacon, one of the Scythian monks sent to Rome to settle certain dogmatic questions.Writing about the year 520 to the African bishops in exile in Sardinia, Peter, an Oriental, mentions a Liturgy of Saint Basil, which was known and used throughout the entire East, and even quotes a passage from it.