eld on ' s ▁plan ▁by ▁invalid ating ▁S eld on ' s ▁assumption ▁that ▁no ▁single ▁individual ▁could ▁have ▁a ▁meas urable ▁effect ▁on ▁gal actic ▁so cio - histor ical ▁tr ends ▁on ▁their ▁own , ▁due ▁to ▁the ▁plan ▁re lying ▁on ▁the ▁predict ability ▁of ▁the ▁actions ▁of ▁very ▁large ▁numbers ▁of ▁people . ▁ ▁From ▁the ▁book ▁" Foundation ' s ▁Edge " ▁we ▁learn ▁that ▁M ule ▁is ▁from ▁planet ▁Ga ia . ▁The ▁M ule ▁establish es ▁his ▁emp ire ▁increment ally , ▁using ▁past ▁con quest s ▁to ▁aid ▁new ▁ones : ▁first ▁by ▁ment ally ▁converting ▁a ▁pir ate ▁band ▁to ▁his ▁alleg iance , ▁then ▁a ▁whole ▁planet , ▁then ▁the ▁militar ily ▁powerful ▁kingdom ▁of ▁Kal gan , ▁which ▁he ▁obtain s ▁by ▁ment ally ▁converting ▁the ▁war l ord ▁of ▁the ▁planet ▁Kal gan , ▁and ▁then ▁the ▁Foundation . ▁The ▁M ule ▁sets ▁up ▁his ▁own ▁short - l ived ▁Gal actic ▁Empire , ▁the ▁" Union ▁of ▁World s ", ▁sty ling ▁himself ▁" First ▁Cit izen ▁of ▁the ▁Union " ▁and ▁making ▁Kal gan ▁its ▁capital ▁planet . ▁Le ading ▁up ▁to , ▁during , ▁and ▁for ▁a ▁good ▁time ▁after ▁the ▁M ule ' s ▁con quest ▁of ▁the ▁Foundation ▁and ▁its ▁trade ▁conf eder acy , ▁almost ▁no ▁one ▁ever ▁actually ▁sees ▁the ▁M ule ▁or ▁knows ▁what ▁he ▁looks ▁like . ▁ ▁The ▁Foundation , ▁after ▁the ▁death ▁of ▁the ▁Empire , ▁is ▁the ▁sole