Julius Marcus (Latin: Julius Marcus Vitellius Caesar Augustus; 7 May, 812 - 9 October 848) was Roman Emperor from 826 to 848, with a five month break in his rule due to the ascension of the usurper Marcellus. During much of his brother's reign, Julius Marcus administered the empire from the capital whilst Fulvian was fighting wars against the Parthians and the Jews. After six years of rule, Fulvian was declared dead following a battle with Jewish Zealots in Palestine, and with no legitimate issue, the principate was handed over to Julius.