What is "insubres"

The Insubres or Insubri were a Gaulish population settled in Insubria, in what is now the Italian region of Lombardy. They were the founders of Mediolanum ( Milan). Though completely Gaulish at the time of Roman conquest, they were the result of the fusion of pre-existing Ligurian and Celtic population with Gaulish tribes who had come from what is now Central Europe.