noun
inside of a castle
Refers to the interior or grounds of a castle. Often used in historical or literary contexts. Compare with 城内 (じょうない), which is more common in modern Japanese.
See also: 城内
敵はすでに城中に侵入していた。
The enemy had already infiltrated the inside of the castle.
城中の様子を探るため、間者が放たれた。
A spy was sent to investigate the situation inside the castle.