It would be very useful at one particular point to know that a trecen is a turn (given that two characters at one point can only stay that long). "Split" and "fivim" would be nice-to-haves but not essential.
I was also initially confused by the term "Logothete", although by the time it mattered for anything, I'd worked out the meaning (which makes me think it could be a one-liner in the Codex about them being the senior Cabinet minister for a subject area).