Although the Old Book of Tang bears Liu Xu's name, most of the compiling was directed by Zhao Ying and others.
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history
Work on the history began in 941 under the chief minister 赵莹. 刘昫 took charge only near the end and presented the finished book to the throne in 945, so it carries his name. 昫 "warm" is a rare character seldom met outside his name.