The Sun and Moon are the symbols of the Székelys, and are used in the coat of arms of Transylvania and on the Romanian national coat of arms. The Sun and the Moon, the symbols of the cosmic world, are known from Hungarian grave findings from the period of the Hungarian conquest. After the Hungarians became Christians in the 11th century, the importance of these icons became purely visual and symbolic. The Székelys have succeeded in preserving traditions to an extent unusual even in Central and Eastern Europe. A description of the Székely Land and its traditions was written between 1859 and 1868 by Balázs Orbán in his "Description of the Székely Land".