《旧唐书·本纪·卷二》
贞观二年春正月，尚书右仆射、齐国公长孙无忌为开府仪同三司。
二年春正月辛丑，尚书右仆射、齐国公长孙无忌为开府仪同三司。
In the spring of the second year of Zhenguan, Deputy Minister Shangshu of the Right, Duke Changsun Wuyi of Qi, became an advisor to the three departments.