same can be also seen in Western Europe when families of different surnames but sharing clan origin would use similar coats-of-arms, the fleur-de-lis of the many Capetian families being perhaps the best-known example. One side-effect of this unique arrangement was that it became customary to refer to noblemen by both their family name and their coat of arms name (or clan name). For example, Jan Zamoyski herbu Jelita means "Jan Zamoyski of the Jelita coat of arms" (though it is often translated as "of the clan Jelita" or herbu is Latinized de armis). From the 15th to 17th centuries, the formula seems to have been to copy the ancient Roman naming convention: praenomen (or given name), nomen gentile (or Gens/Clan name) and cognomen (surname), following the Renaissance fashion. So we have Jan Jelita Zamoyski, forming a double-barrelled name (nazwisko złożone, literally "compound name"). Later, the double-barrelled name began to be joined with a hyphen: Jan Jelita-Zamoyski. (See Polish names). The Polish émigrés of the 19th century sometimes used adaptations of their names according to the Western European (mainly French) style, becoming e.g. Balthasar Klossowski de Rola (Balthus), Jean de Bloch (Jan Gotlib Bloch), or Tamara de Lempicka. Some would also keep the Latin forms of their surnames, as Latin was the official language of the Kingdom of Poland, hence the popularity of Late-Medieval or Early-Modern forms such as "de Zamosc Zamoyski". A single coat of arms could appear in slightly different versions, typically in different colours, depending on the custom of the family using it. Such variations (odmiany) are still considered as representing the same coat of arms. One of the most visually striking characteristics of Polish heraldry is the abundance of gules (red) fields. Among the oldest coats of arms in Poland, nearly half use a red background, with blue (azure) coming in a distant second. Nowhere else in Europe is there seen such a strong bias towards a particular colour scheme. It follows, however, the well-known heraldic custom of all Europe, of the vassals following the colour-scheme of their overlord, which found practical use on the battlefield. Other typical features used in Polish heraldry include horseshoes, arrows, Maltese crosses, scythes, stars, and crescents. There are also many purely geometrical shapes for which a separate set of heraldic terms was invented. It has been suggested that originally all Polish coats of arms were based on such abstract geometrical shapes,