In roman government, who represented the rights of plebeians?

In ancient Rome, it was the Patricians who represented the rights of plebeians. The plebeians had very few rights of there own, and often were not able to makde decisions. 

Jerusalem  europeans will to trade with far east via for exemple the silk roade which was often closed by muslim rulers  were the economic factors that led to the crusades religious factor was will to retake jerusalm to be the sfae for piligrims once more political factor wa sinavsion fo seljuk turks on yzantium and emperoro alexios comnenos ask for