sentences:  Emperor Taizong's reign also began to designate certain high-level officials, even though they were not heads of one of the bureaus, as chancellors, with titles such as "Cānyù" Cháozhèng (參豫朝政, literally "participator in the administration's governance").Yet later in 643, he revised the designation and formalized it as the "Tóngzhōngshūménxiàsānpǐn" (同中書門下三品, literally meaning "equivalent to the officials with the third rank from the "Zhōngshū" and the "Ménxià"") — because the heads of the legislative bureau, the "Zhōngshūlǐng" (中書令), and the examination bureau, the "Shìzhōng" (侍中), were of the third rank.These officials were rendered as "chancellors de facto'" "Shízhìzǎixiàng" (實質宰相) by the Chinese historian Bo Yang in his modern Chinese edition of the "Zizhi Tongjian".