Its inhabitants belonged to the group of the Celtic tribes of Hispania Citerior known as the Lusones tribe, of which Bilbilis was their capital. Their earliest coin issue includes a male head facing right, with dolphin to the left of the portrait on the obverse, while the reverse depicts a horseman carrying a spear and the inscription "Bilbilis". These date from the late 2nd to the early 1st century BC and a number of these form part of the Iberian coin collection in the British Museum.