ORDO BYZANTINUS SANCTI SEPULCHRI [OBSS] is a sovereign, Dynastic Order of Chivalry which recalls the values of Christian Chivalry and forms part of the historical heritage of religious-chivalric Orders, particularly the Greek-Orthodox Order of the Holy Sepulchre, the first Order of the Byzantine Empire founded in theA.D. 325 by Constantine the Great, son of St. Helen.