Ya/sas （1） One of S/a^kyamuni's earliest disciples， the son of the wealthy man Suprabuddha of Va^ra^n!asi^波罗奈国. （2） A monk who lived about one hundred years after the death of S/a^kyamuni， who ended up becoming the central figure in the Second Buddhist Council 第二结集， after he accused the Vajjiputtaka monks of immoral practices.