《北史·列传·卷七十》
周武帝保定三年，大造宫殿，春夏二季大旱，诏令公卿和文武百官，尽力上言朝政得失。
保定三年，盛营宫室。春夏大旱，诏公卿百僚，极言得失。
In the third year of Emperor Wu of Zhou, the palace was built, and there was a great drought in spring and summer. The officials were ordered to speak their opinions on the gains and losses of the court. 