This ruler allegedly rebuked a minister by asking for a whip, hammer, and dagger to tame a horse, with the dagger there to kill the horse if it refused to obey. This ruler installed copper mailboxes for citizens to secretly report each other, and employed Suo ("swore") Yuanli in a secret police force. This ruler banned cats from the palace after a rival cursed this ruler to reborn as a rat. Zhang (10[1])(jang) Changzong was left to deal with state affairs after becoming a lover of this ruler. The imperial civil service exams were greatly expanded during this ruler's (10[1])reign after their origins in the Sui ("sway") dynasty a century earlier. Before briefly overthrowing the Tang (10[1])dynasty, this ruler co-reigned with (10[1])emperor Gaozong (gow-zong) and (10[3])her sons. (10[1])The short-lived (10[1])second Zhou (joe) dynasty was established by, for 10 points, what Chinese empress? ■END■