The thesis deals with the concept of diaconate and the diacon's service in the Byzantine tradition. The first part deals with the diaconate in the New Testament. The second part focuses on the historical development of the Byzantine rite as well as of the diaconate from the charitable, administrative and liturgical perspektive where the liturgical aspekt begins to dominate. The third part introduces the Liturgies (Masses)in the Byzantine tradition with consideration for the Liturgy of St. John Chrysostom and stresses his irreplaceable role.