<0xE8> <0xB5> <0xB5> 郡 李 氏 , ▁the ▁C ui ▁family ▁of ▁Bol ing ▁ 博 <0xE9> <0x99> <0xB5> <0xE5> <0xB4> <0x94> 氏 , ▁the ▁C ui ▁family ▁of ▁Q ing he ▁ 清 河 <0xE5> <0xB4> <0x94> 氏 , ▁the ▁Lu ▁family ▁of ▁F any ang ▁ <0xE8> <0x8C> <0x83> 陽 <0xE7> <0x9B> <0xA7> 氏 , ▁the ▁Zh eng ▁family ▁of ▁X ing y ang ▁ <0xE8> <0x8D> <0xA5> 阳 <0xE9> <0x83> <0x91> 氏 , ▁the ▁Wang ▁family ▁of ▁Tai y uan ▁ 太 原 王 氏 , ▁and ▁the ▁Li ▁family ▁of ▁Long xi ▁ <0xE9> <0x9A> <0xB4> 西 李 氏 ▁were ▁the ▁seven ▁noble ▁families ▁between ▁whom ▁marriage ▁was ▁b anned ▁by ▁law . ▁Mor i ya ▁M its uo ▁wrote ▁a ▁history ▁of ▁the ▁Later ▁Han - T ang ▁period ▁of ▁the ▁Tai y uan ▁Wang . ▁Among ▁the ▁strong est ▁families ▁was ▁the ▁Tai y uan ▁Wang . ▁The ▁prohib ition ▁on ▁marriage ▁between ▁the ▁cl ans ▁issued ▁in ▁ 6 5 9 ▁by ▁the ▁Ga oz ong ▁Emperor ▁was ▁fl out ed ▁by ▁the ▁seven ▁families ▁since ▁a ▁woman ▁of ▁the ▁Bol ing ▁C ui ▁married ▁a ▁member ▁of ▁the ▁Tai y uan ▁Wang , ▁giving ▁birth ▁to ▁the ▁poet ▁Wang ▁Wei . ▁He ▁was ▁the ▁son ▁of ▁Wang ▁Ch ul ian ▁who ▁in ▁turn ▁was ▁the ▁son ▁of ▁Wang ▁Z hou . ▁The ▁mar ri ages ▁between ▁the ▁families ▁were ▁performed ▁c land est in ely ▁after ▁the ▁prohib ition ▁was ▁implemented ▁on ▁the ▁seven ▁families