Guānyú zhè wèi huángdì, shǐshū shàng de jìzǎi hěnshǎo.
The histories say very little about this emperor.
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The great 史书 are the 二十四史, the Twenty-Four Histories, beginning with 司马迁's 《史记》. From the Tang onward, each dynasty compiled the official history of the one before it.