Dessobriga, Archaeological site in Osorno-Melgar de Fernamental, Spain.

Dessobriga is an archaeological site on the Las Cuestas hill, spanning the border of Palencia and Burgos provinces near Osorno and Melgar de Fernamental. Excavations in 2001 uncovered 19 circular dwellings of the First Iron Age, arranged along three streets, one paved with quartzite pebbles. A defensive wall from the Second Iron Age and a large circular adobe hut with a bench were also found.

The fortified settlement was founded during the Iron Age between the 8th and 5th centuries BC and was later converted into a Roman mansio along the Asturica-Tarraco road.

The name Dessobriga comes from Celtic roots: 'dess' means south or right, while 'briga' refers to a fortified settlement. These name elements reveal the Celtic origins of the region, which remain embedded in how the place is identified today.

The site lies on the Las Cuestas hillock, split by the provincial border between Palencia and Burgos, with the access near Osorno and Melgar de Fernamental. The excavated area covers 5,000 square metres, and the terrain is uneven with no paved paths, so wear sturdy shoes. The 2013 geomagnetic surveys mapped a town of 194 hectares, most of it unexcavated.

Among the Augustan coins found at the site are five asses struck at Bílbilis, Calagurris, Celsa and Turiaso, plus a denarius from Lugdunum dated 2 BC–AD 14. These issues show the settlement was already tied into Roman monetary circulation in the early imperial period.