Who is percival and what happpens to him in ch 4 the lord of the flies?

During the assembly in chapter 5 Ralph attempts to settle the issue of the beast once and for all and convince the boys that it does not exist. He has two littluns who claim to have seen it brought forward. The littun Phil's claims to have seen the beast are quickly dismissed, as it seems likely that he simply mistook Simon for the beast. Unfortunately Ralph's plan backfires when Percival Wemys Madison is told that there is nowhere on the island that a beast could hide he drops a bombshell. Speaking through Piggy and then Jack he tells the boys that the beast comes from the sea.