1 ▁BC , ▁a ▁law ▁was ▁passed ▁to ▁allow ▁the ▁ple be ians ▁to ▁begin ▁organ izing ▁by ▁tribe . ▁Thus , ▁the ▁" P le be ian ▁C uri ate ▁Assembly " ▁began ▁to ▁use ▁tribes , ▁rather ▁than ▁cur iae , ▁as ▁its ▁basis ▁for ▁organization . ▁As ▁such , ▁the ▁Ple be ian ▁Council ▁changed ▁from ▁a ▁" P le be ian ▁C uri ate ▁Assembly " ▁to ▁a ▁" P le be ian ▁Trib al ▁Assembly ". ▁ ▁The ▁only ▁difference ▁between ▁the ▁Ple be ian ▁Council ▁after ▁ 4 7 1 ▁BC ▁and ▁the ▁ordinary ▁Trib al ▁Assembly ▁( which ▁also ▁organized ▁on ▁the ▁basis ▁of ▁the ▁tribes ) ▁was ▁that ▁the ▁tribes ▁of ▁the ▁Ple be ian ▁Council ▁included ▁only ▁ple be ians , ▁whereas ▁the ▁tribes ▁of ▁the ▁Trib al ▁Assembly ▁included ▁both ▁ple be ians ▁and ▁patr icians . ▁However , ▁most ▁Rom ans ▁were ▁ple be ians . ▁Therefore , ▁the ▁principal ▁differences ▁between ▁the ▁Ple be ian ▁Council ▁and ▁the ▁Trib al ▁Assembly ▁were ▁mostly ▁legal ▁rather ▁than ▁dem ographic . ▁These ▁legal ▁differences ▁derived ▁from ▁the ▁fact ▁that ▁Roman ▁law ▁did ▁not ▁recognize ▁an ▁assembly ▁consisting ▁only ▁of ▁one ▁group ▁of ▁people ▁( ple be ians ▁in ▁this ▁case ) ▁from ▁an ▁assembly ▁consisting ▁of ▁all ▁of ▁the ▁People ▁of ▁Rome . ▁Over ▁time , ▁however , ▁these ▁legal ▁differences ▁were ▁mit ig ated ▁with ▁legisl ation . The ▁Ple be ian ▁Council ▁elected ▁two ▁ple be ian ▁officers , ▁the ▁trib