Egbert is a noble in the house of Aethelbald, a long-standing, influential noble family whose lineage can be traced back to the founding of Falena. When the capital of Falena was moved from Stormfist to Sol-Falena, the Queen gave the ruling of Stormfist over to the Aethelbalds.
However, one hundred years prior to Suikoden V, the Godwin family came into power and ursurped control from the Aethelbalds. The family Aethelbald lived in the sewers of Stormfist, which is where Egbert first met the Prince and his entourage. After the Godwins took control of Falena, Egbert moved to the Baska Mines, where the Prince met him again.
Egbert has a tendency to lapse into extreme mania whenever he discusses the Godwin family, calling them "filthy devils" and other extreme phrases. He is apologetic afterwards, but the Prince was polite enough to listen to him completely. Egbert did desire to remove the Godwins from power, and joined the Prince's army. - Matt620 (article), Basel (image)