3 surviving letters between Ambrosius, Quaestor and Cassiodorus, spanning 522 AD.
VARIAE, BOOK 8, LETTER 13
Senator [Cassiodorus], Praetorian Prefect, to Ambrosius, Vir Illustris, Acting Prefect.
Those who observe changes in the usual order of things are often troubled, because what runs counter to custom...