Valter

Valter is a sadistic Wyvern Knight who wields his Lance with unsurpassed skill and strength. He was part of the Imperial Three alongside Duessel and Glen; however, he was eventually fired by the Emperor for the mistreatment of innocents and slaughtering of surrendered opponents. When Vigarde was revived by the Dark Stone, Lyon reinstated him as a general alongside Caellach and Riev.

(Source: Fire Emblem Wiki)