What is the function of "に" in the following sentence? > …… The slave asked the king to call him by his first name instead of using his surname + "san", so the king asked him why. Then, the slave answered the above sentence. I don't understand the function of the particle "", because it seems to imply that is too much to call a king with honorifics, although with the context, it's exactly the opposite: to call a slave with honorifics. Is "" linked to ""?

It's the other way around. "……" means it is too much for the king to call him with honorifics. The form A simply means A is doing the action for the speaker.