The crescent appears in flags attributed to Tunis from as early as the 14th century Book of Knowledge of All Kingdoms, long before Tunis fell under Ottoman rule in 1574. The Spanish Navy Museum in Madrid shows two Ottoman naval flags dated 1613; both are swallow-tailed, one green with a white crescent near the hoist, the other white with two red stripes near the edges of the flag and a red crescent near the hoist.[12]