sentences:  Throughout Tang history, the names of the examination and legislative bureaus were changed multiple times, and so the designation of "Tóngzhōngshū Ménxià Sānpǐn" was frequently changed in response thereof.For example, during the reign of Emperor Xuanzong, when the legislative bureau was briefly known as the "Zǐwéishěng" (紫微省) and the examination bureau the "Huángménshěng" (黃門省), the chancellors de facto were known as the "Tóng Zǐwéi Huángmén Sānpǐn".A lesser designation, with the same powers, was created in 682 during the reign of Emperor Gaozong, and was initially known as the "Tóng" "Zhōngshū Ménxià Píngzhāngshì" (同中書門下平章事, literally "equivalent to the participators from the "Zhōngshū" and the "Ménxià""), rendered by Bo as "chancellors de facto second grade."