'Citadel' in the Bible

When he came to the citadel, he took them from their hand and put them in the house, then sent away the men so that they went.

It happened that when he finished offering the burnt offering, Jehu said to the royal guard and to the officers, "Come and kill them; let no man go free!" So {they put them to the sword}, and the royal guard and the officers threw them out, then they went up to the citadel of the temple of Baal.

Then his officer, Pekah son of Remaliah, conspired against him and struck him down in Samaria at the citadel of the king’s palace —as well as Argob and Arieh. There were 50 Gileadite men with Pekah. He killed Pekahiah and became king in his place.