The Leucī (Gaulish: Leucoi, 'the bright, lightning ones') were a Belgic tribe dwelling in the southern part of the modern Lorraine region during the Iron Age and the Roman period.
Irish luach 'glowing white', Middle Welsh llug 'eyesight, perception'), itself from Proto-Indo-European *leukós ('bright, shining'; cf.
[10] Hillforts held by the Leuci included a large oppidum at Boviolles (Ornain valley), west of their territory, and some smaller ones located in the Vosges.
The Roman-era successor of Boviolles was more imposing than the central city Tullum, since the Ornain river served as an important trade route between Champagne and the plateau of Langres, on the territory of the Lingones.
[8] They are mentioned by Julius Caesar as a people supplying wheat to the Roman army in 58 BC, along with the Lingones and Sequani.