[kijin]

Besides, the author probably talks like that in real life, too, so he's already doing what PG says he should do. When you study ancient stuff a lot, it becomes part of your personality. You acquire a lot of choice quotes that over time become part of your everyday vocabulary.

I love it when historians mix archaic language into their everyday speech for dramatic effect! It's vastly different from when ordinary people clumsily try their hand at archaism. Coming from someone who actually knows what they're saying, it feels so much more authentic and appropriate.