Who was King Zhaoxiang of Qin's mother?
King Zhaoxiang of Qin
In 307 BC, King Nan of Zhou hosted King Wu of Qin, who just returned victorious against Han at the Battle of Yiyang.  During the visit, King Wu, a keen wrestler, decided to try lifting the "dragon-patterned red cauldron" (龍紋赤鼎) in the Zhou palace.  He died from the attempt, bleeding from his eyes and breaking his shin bones.  After the childless King Wu died, his hostage half-brother Ying Ji returned to claim the throne as King Zhaoxiang.