1Honorific/archaic: to be; an honorific equivalent meaning someone (often a superior or deity) is present or exists.
古文では、天皇は宮中に在すと記されることがある。
In classical texts, it is sometimes written that the emperor 'is in the palace' (在す).
2Honorific/archaic: to go/come; used respectfully to indicate movement of a superior (classical usage).
高官は都へ在ますとの噂が流れた（古語的表現）。
There was a rumor that the high-ranking official would go to the capital (古語 expression).