Lerias Welon is a character appearing in Mount and Blade classic, version .202, aka Warrider.
Lerias was the leader of the rebelling peasants of Serrepa. The player would meet him during one of the quest for one of the two joinable kingdoms. If the player sided with the Kingdom of Vaegirs, they would be sent to negotiate with Lerias. If they side with the Kingdom of Swadia, they will be assigned to escort Captain Rucas, who will do the negotiating. Either way, it can be assumed that both kingdoms had sent their own envoys regardless of who the player sided with.
Although originally distrusting of the envoys, Lerias agreed to negotiate. If the player sided with the Vaegirs, Lerias would demand an official document from Count Aolbrug that promised amnesty to the rebels and additional rights for peasants. If the player sided with the Swadians, Lerias would agree to swear loyalty to them in exchange for their military support against the Vaegirs, and other benefits. Regardless of which kingdom the player sided with, neither keeps their promises and Lerias and the rebels are ultimately killed or imprisoned.
Upon learning that the rebellion was deceived, Lerias gathers a group of peasant rebels and challenges the player, accusing them of being a liar. If he survives the ensuing fight, he is devastated by the realization that the peasants will never be free and the rebellion was pointless. After that he is taken to prison. His further fate is unknown, but it can be assumed that he is eventually executed.