Anto´nia, a fortress in Jerusalem, on the north side of the area of the temple, often mentioned by Josephus in his account of the later wars of the Jews. It was originally built by the Maccabees, under the name of Baris, and was afterwards rebuilt with great strength and splendor by the first Herod. This fortress is the 'castle' into which Paul was carried from the temple by the soldiers: from the stairs of which he addressed the people collected in the adjacent court (Acts 21:31-40).