Noun
Silures pl (plural only)
(historical) A powerful and warlike tribe or tribal confederation of ancient Britain, occupying what is now southeast Wales and perhaps some adjoining areas.
The Silures were not finally conquered until circa AD 76 when Sextus Julius Frontinus ' long campaign against them began to have success. Source: Internet
The Silures of southeast Wales caused considerable problems to Ostorius and fiercely defended the Welsh border country. Source: Internet