A lancer was a type of cavalryman who fought with a lance. Lances were used in mounted warfare by the Assyrians as early as 700 BC and subsequently by Greek, Persian, Gallic, Han-Chinese, nomadic and Roman horsemen. The weapon was widely used in Asia and Europe during the Middle Ages and the Renaissance by armoured cavalry before being adopted by light cavalry, particularly in Eastern Europe. In a modern context, a lancer regiment usually denotes an armoured regiment.
Read more about Lancer: 17th–19th Century, Lancer's Equipage, 20th Century Lancers, Current Lancer Units