Then shouldn't there be some guardians who died in Medival times, or other old time periods? Would they keep the same manner of speaking they had? Imagine a guardian who addresses lightless citizens as peasants!
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It's a interesting concept to think about It's not exactly known how much of the remains must be in tact for a Ghost to revive a a human/awoken, so unless Ghosts can literally revive a person from 12 thousand year old dust it's unlikely However it's still possible Although Guardians do loose all their memories from their first life so if there was actually a medieval age Guardian he/she/they wouldn't call people peasant Unfortunately