This has nothing to do with horror movies. Rather it refers to a Roman public warehouse.
Roman remains are still visible in Europe. We can only guess that there were many, many more in the medieval world. Sometimes Roman temples were turned into churches, and at other times, Roman stonework was mined for new buildings. Under the city of Narbonne was a huge Roman storage area, an underground warehouse, a vast Horreum. The city was located at the crossroads of two major Roman roads and a Roman canal connected the River Aude to the sea by a Roman canal 13 kilometer’s long, turning the city into a port. I have to wonder what Ermengarde and her contemporaries thought of the Roman presence.
I toured the Horreum in Narbonne while researching Ermengarde of Narbonne. Please consider nominating my medieval novel on Kindle Scout.