Trésor gaulois de Laniscat, Celtic coin collection in Laniscat, France

The Trésor gaulois de Laniscat is a hoard of 545 electrum coins, comprising 58 staters and 487 quarter staters, struck by the Osismes. The coins were found scattered across about 200 m² within the Rosquelfen enclosure, their surfaces ranging from bright yellow-gold to darker amber, with raised relief designs and no readable inscriptions.

The hoard was buried in the Rosquelfen enclosure around 75-50 BC, just before the Roman conquest of Gaul. The 545 electrum coins were struck by the Osismes, an Armorican people, and include 58 staters and 487 quarter staters. The metal, gold and silver with a high copper content, supports this dating. The farm itself was founded in the 3rd century BC and abandoned in the 1st century AD.

The coins display Celtic designs showing horses, human figures, and hybrid creatures that reflect the artistic traditions of pre-Roman Gaulish society. These depictions offer insight into the symbols and beliefs that mattered to the people living in this region.

The hoard was found in spring 2007 inside the Iron Age enclosure at Rosquelfen, near the village of Laniscat, during surveys ahead of the RN 164 dual-carriageway works. The 545 coins lay scattered over about 200 m² because of repeated ploughing, so there is no single findspot to see. The enclosure covered 7,500 m², with six porched entrances and a palisaded inner yard.

The hoard is the largest coin treasure found in Armorica, not in all Gaul. Its location on the edge of the Osismes' territory also helps fix the tribe's eastern frontier, which historians had previously placed with less certainty.