The flag of Tunisia is a rectangular panel of red color with an aspect ratio of 2:3. In the center of the cloth in a white circle is placed a red crescent, surrounding a red five-pointed star on three sides. The Tunisian Bey Hussein II decided to create a flag for Tunisia, close in appearance to the modern one, after the Battle of Navarino on 20 October 1827; in 1831 he was officially approved. In that form, the flag existed during the French protectorate, and on 1 June 1959, it was proclaimed the state flag of the Republic of Tunisia (in accordance with the Tunisian Constitution). On 30 June 1999, the proportions and design of the flag were clarified by a special law. The general appearance of the flag remained virtually unchanged. The crescent and the star depicted on the flag of Tunisia are traditional symbols of Islam and are also considered symbols of good luck. Until the mid-18th century, the design and significance of maritime flags flying on ships in Tunis are unknown. However, various sources have been able to distinguish certain similarities among the flags: they were designed with a crescent-oriented shape in the presence of the colors blue, green, red, and white. Thereafter, and until the early 19th century, the flag was composed of horizontal blue, red and green stripes, which are the colors of the ruling Husainid dynasty. This kind of flag with multiple bands and irregular contours floated on top of ships all along the coast of North Africa; similar flags with different colors and arrangements were also used in Africa. According to Ottfried Neubecker, the Bey of Tunis also had his own flag. This flag was most likely a simple personal banner of the ruler, as it floated above the Bardo Palace, the Citadel of Tunis, on navy ships, and also in the center of the coat of arms in Tunisia. It was used at a number of public ceremonies until the abolition of the monarchy and proclamation of Republic on 25 July 1957.