 Sacred documents are the documents and official letters of the patriarchs, including the "gramma, homologia" (creeds), "diatheke" (testaments), "aphorismos" (excommunication), "paraitesis" (abdication) as well as the ceremonial "praxis" ("synodike") and the "hypotyposis" (the resolution of a synod) and the "tomos" (dogmatic edicts).The most splendid form of privileged communication, in the form of a letter, was "chrysobullos logos" so called because the Emperor's word (logos) appeared three times in red ink.They were used in the appointments of Imperial ambassadors and they were stamped with the Imperial golden seal (Chrysos = gold and bulla = seal).