Herodium during the period of the Great Jewish Revolt

The Palace-Fortress on the Herodium hill, built by Herod, continued to be used by his heirs and the Roman governors of Judaea, until its capture by the Jewish zealots at the start of the First Revolt (apparently in 66 CE). During the course of the rebellion, the site was occupied by Idumean Jews from “Daroma” (Idumea), and also, apparently, some zealots or “Sicarii”, allied to Simon Bar Giora (The Jewish Wars, IV, pp. 514-537)
In a similar manner to Masada, here too the rebels crowded into the Fortress-Palace, exploiting every corner for their own day-to-day needs. They dismantled the decorative columns and wooden beams, and re-used them for makeshift structures. It is possible that already during the revolt, the Herodian hall was converted to a synagogue, with two ritual baths adjacent to it. According to Josephus, Herodium was one of the three fortresses that held out against the Roman army after the destruction of the Temple in 70 CE (along with Masada and Machaerus in Trans-Jordan).
Herodium was conquered by the Romans and destroyed in 71 CE, at the end of the revolt, either through surrender or in battle (The Jewish Wars, VII, 163).

Read more:

• Netzer E., Kalman Y., Porat R., and Chachy R., 2011. “Herodium During the Two Revolts,” A. Tavger, Z. Amar, and M. Billig (eds.) In the Highland’s Depth I, Pp. 59–68. (in Hebrew)

• Stiebel G. D., 2003. “The militaria from Herodium”, G.C. Bottini et al (eds.) One Land – Many Cultures, Jerusalem, Pp. 215-244.