What role did peter the hermit play in the first crusade?

peter the hermit, french pierre l’ermite, (born c. 1050, probably amiens, france—died july 8, 1115, neufmoustier, near huy, flanders [now in belgium]), ascetic and monastic founder, considered one of the most important preachers of the first crusade. he was also, with walter sansavoir, one of the leaders of the so-called people’s crusade, which arrived in the east before the main armies of the first crusade.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion