Alexandrium was constructed by the Hasmoneans near the border with Samaria to accommodate a military garrison, as well as to guard political prisoners.[5] It is later mentioned during Pompey the Great's conquest of Judea as a stronghold of Aristobulus II: "...as he passed by Pella and Scythopolis, he came to Corem, which is the first entrance into Judea when one passes over the midland countries, where he came to a most beautiful fortress that was built on the top of a mountain called Alexandrium, whither Aristobulus had fled/"[6]