'Castle' in the Bible

"Whenever a strong man, fully armed and equipped, is guarding his own castle, he enjoys peaceful possession of his property;

And some cried one thing, some another, among the multitude: and when he could not know the certainty for the tumult, he commanded him to be carried into the castle.

And as Paul was to be led into the castle, he said unto the chief captain, May I speak unto thee? Who said, Canst thou speak Greek?

The chief captain commanded him to be brought into the castle, and bade that he should be examined by scourging; that he might know wherefore they cried so against him.

And when there arose a great dissension, the chief captain, fearing lest Paul should have been pulled in pieces of them, commanded the soldiers to go down, and to take him by force from among them, and to bring him into the castle.

And when Paul's sister's son heard of their lying in wait, he went and entered into the castle, and told Paul.

On the morrow they left the horsemen to go with him, and returned to the castle: