釋氏稽古略 1.228

1.228

叔振鐸。文王子。武王封之於曹（濟寧路曹州也。豫州之域）。五世至孝伯年不可考。孝伯之子夷伯立而後可紀。始武王元年己卯。終敬王三十三年甲寅。二十五君合六百三十六年。宋景公滅之。

Shu Zhenduo was a son of King Wen. King Wu enfeoffed him in Cao (Caozhou in Jining Route, territory of Yuzhou). For five generations down to Earl Xiao, the chronology cannot be verified; it can only be recorded after Earl Xiao's son, Earl Yi, acceded. It began in the first year of King Wu, a jimao year, and ended in the thirty-third year of King Jing, a jiayin year. There were twenty-five rulers, spanning a total of 636 years. Duke Jing of Song extinguished it.