The Roman History · Amm. 23.6.6

So that they still worship and honour Arsaces as a god, and down to our day have given him so much honour that, in conferring the royal power, one of his race has been always preferred to any one else. And also in intestine quarrels, such as are common in that nation, every one avoids as sacrilege wounding any descendant of Arsaces, whether in arms or living as a private individual.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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