is assumed that the sword was intended to be drawn with the blade pointing downwards ready for surprise stabbing attacks. In the 12th century, the Seljuq dynasty had introduced the curved shamshir to Persia, and this was in extensive use by the early 16th century. Chinese antiquity Chinese iron swords made their first appearance in the later part of the Western Zhou dynasty, but iron and steel swords were not widely used until the 3rd century BC Han dynasty. The Chinese dao (刀 pinyin dāo) is single-edged, sometimes translated as sabre or broadsword, and the Jian (劍 or 剑 pinyin jiàn) is double-edged. The zhanmadao (literally "horse chopping sword"), an extremely long, anti-cavalry sword from the Song dynasty era. Middle Ages Europe Early and High Middle Ages During the Middle Ages sword technology improved, and the sword became a very advanced weapon. The spatha type remained popular throughout the Migration period and well into the Middle Ages. Vendel Age spathas were decorated with Germanic artwork (not unlike the Germanic bracteates fashioned after Roman coins). The Viking Age saw again a more standardized production, but the basic design remained indebted to the spatha. Around the 10th century, the use of properly quenched hardened and tempered steel started to become much more common than in previous periods. The Frankish 'Ulfberht' blades (the name of the maker inlaid in the blade) were of particularly consistent high quality. Charles the Bald tried to prohibit the export of these swords, as they were used by Vikings in raids against the Franks. Wootz steel which is also known as Damascus steel was a unique and highly prized steel developed on the Indian subcontinent as early as the 5th century BC. Its properties were unique due to the special smelting and reworking of the steel creating networks of iron carbides described as a globular cementite in a matrix of pearlite. The use of Damascus steel in swords became extremely popular in the 16th and 17th centuries. It was only from the 11th century that Norman swords began to develop the crossguard (quillons). During the Crusades of the 12th to 13th century, this cruciform type of arming sword remained essentially stable, with variations mainly concerning the shape of the pommel. These swords were designed as cutting weapons, although effective points were becoming common to counter improvements in armour, especially the 14th-century change from mail to plate armour. It