# sat on his royal throne

Here "royal throne" may refer to his rule over the kingdom. Alternate translation: "ruled the empire" (See: [[rc://en/ta/man/translate/figs-metonymy]])

# fortress

This refers to a castle, stronghold or fortified city.

# Susa

This was a royal city of Persian kings. (See: [[rc://en/ta/man/translate/translate-names]])