@welcome2atlantis Gramercy is incredibly archaic, though. Outside of deep dives into literary analyses, you won't really be seeing the word much, if at all - it works here because of the ancient and formal setting (and shows Yiren displaying full courtesy to his majesty), but yeah. It is a fun word to know, nevertheless!
Incredibly archaic words are fun sometimes for sure. Some of them could be brought back if enough people like how they sound (a lot of them are kind of silly, so I enjoy them for that).