By the 6th century, the lateen sail had largely replaced the square sail throughout the Mediterranean, the latter almost disappearing from Mediterranean iconography until the mid-13th century. It became the standard rig of the Byzantine dromon war galley and was probably also employed by Belisarius' flagship in the 532 AD invasion of the Vandal kingdom. The fully triangular lateen and the settee continued to coexist in the middle Byzantine period, as evidenced by Christian iconography, as well as a recent find of a graffito in the Yenikapı excavations. In the 12th to 13th centuries the rigging underwent a change when the hook-shaped masthead made way for an arrangement more akin to a barrel-like crow's nest.