ao ▁Pi , ▁the ▁first ▁em peror ▁of ▁Wei . ▁His ▁mother , ▁whose ▁family ▁name ▁was ▁Pan ▁( <0xE6> <0xBD> <0x98> ), ▁was ▁a ▁conc ub ine ▁of ▁C ao ▁Pi ▁holding ▁the ▁rank ▁of ▁sh uy uan ▁( <0xE6> <0xB7> <0x91> <0xE5> <0xAA> <0x9B> ; ▁translated ▁" Dec ent ▁Conc ub ine "). ▁He ▁was ▁en fe off ed ▁as ▁the ▁Prince ▁of ▁Yang ping ▁County ▁( 陽 平 <0xE7> <0xB8> <0xA3> 王 ) ▁in ▁ 2 2 6 ▁after ▁his ▁half - bro ther , ▁C ao ▁R ui ▁( <0xE6> <0x9B> <0xB9> <0xE5> <0x8F> <0xA1> ; ▁note ▁the ▁different ▁character ▁for ▁R ui ), ▁succeeded ▁their ▁father ▁as ▁the ▁em peror ▁of ▁Wei . ▁In ▁ 2 3 2 , ▁his ▁title ▁was ▁changed ▁to ▁Prince ▁of ▁Be ih ai ▁( 北 海 王 ). ▁He ▁died ▁in ▁ 2 3 3 . ▁ ▁In ▁ 2 3 4 , ▁( em peror ) ▁C ao ▁R ui ▁designated ▁C ao ▁Z an ▁( <0xE6> <0x9B> <0xB9> <0xE8> <0xB4> <0x8A> ), ▁a ▁desc endant ▁of ▁C ao ▁Ju , ▁as ▁( de ce ased ) ▁C ao ▁R ui ' s ▁he ir ▁and ▁en fe off ed ▁him ▁as ▁the ▁Duke ▁of ▁Ch ang ▁District ▁( 昌 <0xE9> <0x84> <0x89> 公 ). ▁In ▁ 2 3 8 , ▁C ao ▁Z an ▁was ▁promoted ▁to ▁Prince ▁of ▁R ao ' an ▁( <0xE9> <0xA5> <0x92> 安 王 ). ▁In ▁ 2 4 6 , ▁during ▁the ▁reign ▁of