In the beginning, all that is known about Silvermask is his obsessive desire to torture and kill both Andragoras and Arislan. He is serving as the leader of the Lusitanian forces but is in fact a Palsian himself and soon commands a regiment of collaborators. He is so named because of the ornate silver helm he wears; it has large silver bull-horns attached to it, and completely obscures his face.

(Source: Wikipedia)