Now with regards to T'aerathi the Usarath is
not asserting a superior authority to the T'aerathi Usarath, in fact he does accept a temporal equality [hence brothers]. Rather he is asserting a superior dignity and honour when he says that his office is not the inferior or equal of any other. In this there may be grounds for T'aerathi objection per their request, however you should understand Angst that the Djaghi Usarath has fully accepted the political and religious legitimacy of the T'aerathi rulership as they requested, so even if they object the response given is excessively hostile. Anyways I will go through the post like I did with Nara's.
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The first paragraph is the Usarath expounding the divine origin of his office, while as I noted above asserting that his office cannot be equal [spiritually, since it is of unique divine institution] or inferior to another [since a divinely ordained office cannot be subject to a human one], as it was ordained directly by the gods. Also note the concluding paragraphs comments regarding authority and magisterium, ie the Usarath in asserting his own unique distinction is not expressing a universal jurisdiction, but is speaking solely in reference to his own place as Lord of Djaghi, and his priestly function as a "revealer of mysteries". Usaraths do not proclaim doctrine, they are not popes.
Thy right, so long as ye upholdest the Law, keep the true words and offer up the eternal rite unto heaven, to govern and rule the dominions of T'aerathun is undoubted, so too thereby is the lawfulness of the utterances of thy mouth.
In the second he asserts the political and religious authority of the T'aerathi Usarath. The key quote above
Here he asserts the T'aerathi Usaraths religious and political authority over T'aerathi in particular, predicated on orthodoxy and right practice is undisputable. And that [second bolded paragraph] the ruler of T'aerathi has equal right to the Usarath of Djaghi to propound upon faith. That is to say utter holy words [precepts] from the gods in reference to Djeharisms emphasis on language and speech. Here in particular he is asserting a real equal authority to himself as a religious leader.
The third paragraph is a bit more complicated so I will go through it in full.
Know then that while it is unquestionable that our office is first amongst the servants of Djehara by divine establishment, and that all owe deference to our magisterium and reverence to our authority on matters of the Law
Here the Usarath reiterates his position as first-servant of Djehara, because his office was established by divine decree. He then says that everyone should owe deference [submissive respect] for his teaching authority and reverence [deep respect] for his authority when it comes to the Law. By this he is firstly asserting that no one should contest or over-rule his teaching authority on the faith. Secondly he is asserting that everyone should respect his authority and not seek to supplant it. He is saying this in order to protect his own legitimacy in Djaghi and to assert his own "sovereignty' as a religious ruler.
your right is certain and your religious sanction to govern thy vassal priests is unquestionable.
He then quickly asserts a second time that the Usarath of T'aerathi has a certain, that is to say undoubted and indisputable right to religious authority and jurisdiction [in T'aerathi].
Indeed we are brothers in upholding the holy law and governing the holy Aenari
He then goes further to stress equality in the real sense, that they are "brothers" in upholding the holy law, in this way also asserting that reverence and deference should be showed to the T'aerathi Usarath's teaching authority and the "utterances of his mouth" as referenced in the second paragraph, and in governing the holy aenari. By saying this he asserts equality in the real temporal sense, that is to say that they have equal religious power [upholding the holy law] and equal political dignity [governing the holy aenari].
with the Usarath of Djaghun being the elder sibling.
Final reassertion that Djaghun has the superior spiritual honour of place of the two because his office was established directly by Djehara.
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To conclude there are definitely legitimate grounds for T'aerathi objection. For instance the T'aerathi Usarath could reject that the heir of Eren'anten has primacy of honour amongst Usarath as he claims, and assert that his office is in no way spiritually less distinguished than his. However in not understanding the depths of my statement I think you have made T'aerathi respond in an excessively hostile manner, particularly given Djaghi has fulfilled the letter of their request [acknowledgement of their religious authority and jurisdiction, as well as their political sovereignty], demurring only in rejecting equal honour.
Yes, the Djaghi usarath has stated he has superior honour both to maintain standing with his vassals and in typical bronze age fashion to present himself as a powerful king, but such a small dispute [given the real authority and jurisdiction are recognised] are relatively trivial [in terms of religious doctrine or politics] given the nature of the diplomatic communication, ie a political alliance request as well as given there is no actual doctrinal quarrel involved.
I also, for a second time, would like to make the assertion that you perhaps misunderstand the nature of the priesthood in Djeharism. We are not talking about popes or patriarchs, but "priest-kings". Their role is not as leaders of a church community but purely monarchical as sovereigns of states. So yes, I have spoken about religious authority, but this is not a universal dare I say "papal" authority, it is simply authority within the political-religious vassal network of the numerous aenari priesthoods and temple hierarchies which the Usarath governs as ruler. Ergo in no way am I saying in my communique that the Usarath of Djaghi has universal authority to expound doctrine, or govern the priesthoods of other nations or dictate to T'aerathi religious precepts. Not at all. Rather his magisterium lies in propounding the mysteries [the holy language being the key one] and practices of the faith as they are, and his authority is as hierarch and ruler of his priestly constituency and territorial jurisdiction, nothing more or less.