According to the New Book of Tang, vol. 44Archived 2007-12-26 at the Wayback Machine, only boys under nine years old were eligible for this examination, and therefore Pei must have passed the examination in 689 or earlier.
According to the New Book of Tang, vol. 44Archived 2007-12-26 at the Wayback Machine, only boys under nine years old were eligible for this examination, and therefore Pei must have passed the examination in 689 or earlier.