Octavianum – Roman background
The Monastery was established on a small hill in El Vallès plain, which is currently part of the historic centre of Sant Cugat del Vallès, very close to Barcelona.
In the low-empire era, sometime after 325, construction began on a fortification near Via Augusta. A castellum, with a square enclosure of 40 metres on each side, with walls and defence towers. There is a theory that Rufinus Octavianum, Comes of Hispania, promoted the work, thereby giving the place its name. Later the site began to have intense religious activity centred on a church built in the 5th century. This activity has been linked to the worship of the martyr Cugat, who according to tradition died in here, victim of the persecutions of Diocletian.