claiborne fox jackson (april 4, 1806 – december 6, 1862) was a pro-confederacy governor of the state of missouri. he was elected in 1860 and sworn in on january 3, 1861 as missouri's 15th governor. he remained in office for five months, until being effectively deposed on june 15, 1861. at that time he fled to arkansas and joined the confederacy. he died on december 6, 1862.