▁had ▁his ▁whole ▁cl an ▁ex termin ated ▁as ▁a ▁result ▁of ▁assist ing ▁the ▁latter ▁in ▁the ▁past . ▁C ao ▁Pi ' s ▁younger ▁brother , ▁C ao ▁X ion g , ▁was ▁also ▁said ▁to ▁have ▁committed ▁suic ide ▁out ▁of ▁fear s ▁for ▁his ▁brother . ▁In ▁summary , ▁under ▁reg ulations ▁established ▁by ▁C ao ▁Pi , ▁not ▁only ▁were ▁the ▁Wei ▁princes ▁( un like ▁princes ▁of ▁the ▁Han ▁dynast y ) ▁dist anced ▁from ▁central ▁politics , ▁they ▁also ▁had ▁minimal ▁authority ▁even ▁in ▁their ▁own ▁principal ities ▁and ▁were ▁restricted ▁in ▁many ▁ways , ▁particularly ▁in ▁the ▁use ▁of ▁military ▁force . ▁ ▁Tre at ment ▁of ▁officials ▁C ao ▁Pi ▁was ▁recorded ▁to ▁frequently ▁rid ic ule ▁his ▁sub ordinates . ▁For ▁example , ▁Yu ▁Jin ▁was ▁captured ▁by ▁Li u ▁Bei ' s ▁general ▁Gu an ▁Yu ▁at ▁the ▁Battle ▁of ▁F anch eng ▁in ▁ 2 1 9 , ▁and ▁was ▁later ▁taken ▁back ▁to ▁Wu ▁and ▁det ained ▁there ▁after ▁the ▁Wu ▁invasion ▁of ▁J ing ▁Province . ▁Yu ▁Jin ▁was ▁allowed ▁to ▁return ▁to ▁Wei ▁after ▁Wu ▁briefly ▁became ▁a ▁v ass al ▁state ▁under ▁Wei ▁in ▁ 2 2 1 . ▁C ao ▁Pi ▁re inst ated ▁Yu ▁Jin ▁as ▁General ▁Who ▁Pac ifies ▁the ▁B orders ▁( 安 遠 <0xE5> <0xB0> <0x87> 軍 ) ▁and ▁announced ▁that ▁he ▁would ▁send ▁Yu ▁Jin ▁back ▁to ▁Eastern ▁Wu ▁– ▁where ▁he ▁had ▁been ▁imprison ed ▁– ▁as ▁an ▁en voy