en_tn_condensed/est/01/02.md

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)