The flag of the Earldom of Rockall is the federal flag designed and adopted by the Duke of Rockall on 19 November, 1727, though officially recognized as having existed Since Time Immemorial. It is made up of a central white field covering half the size of the flag, with the quarter beneath (from upper to lower) divided into blue, yellow and red, with the quarter above (from upper to lower) divided into white, black and green.