Demographically, Cilician Armenia was heterogeneous with a population of Armenians who constituted the ruling class, and also Greeks, Jews, Muslims, and various Europeans. The multi-ethnic population, as well as commercial and political links with Europeans, particularly France, brought important new influences on Armenian culture. The Cilician nobility adopted many aspects of Western European life, including chivalry, fashion, and the use of French Christian names. The structure of Cilician society became more synonymous with Western feudalism than to the traditional nakharar system of Armenia. In fact, during the Cilician period, Western titles such as baron and constable replaced their Armenian equivalents nakharar and sparapet. European tradition was adopted for the knighting of Armenian nobles, while jousts and tournaments similar to those in Europe had become popular in Cilician Armenia. The extent of Western influence over Cilician Armenia is also reflected by the incorporation of two new letters (Ֆ ֆ = "f" and Օ օ = "o") and various Latin-based words into the Armenian language. In other areas, there was more hostility to the new Western trends. Above all, most ordinary Armenians frowned on conversion to Roman Catholicism or Greek Orthodoxy. Cultural influence was not merely one-way, however; Cilician Armenians had an important impact on Crusaders returning to the West, most notably with their architectural traditions. Europeans incorporated elements of Armenian castle-building, learned from Armenian masons in the Crusader states, as well as some elements of church architecture. Most Armenian castles made atypical usage of rocky heights, and featured curved walls and round towers, similar to those of the Hospitaller castles Krak des Chevaliers and Marqab. The Cilician period also produced some important examples of Armenian art, notably the illuminated manuscripts of Toros Roslin, who was at work in Hromkla in the thirteenth century. Economy Cilician Armenia had become a prosperous state due to its strategic position on the eastern shores of the Mediterranean. It was located at the juncture of many trade routes linking Central Asia and the Persian Gulf to the Mediterranean. The kingdom was thus important in the spice trade, as well as livestock, hides, wool, and cotton. In addition, important products such as timber, grain, wine, raisins, and raw silk were also exported from the country and finished cloth and metal products from the West were made available. During the reign of King Levon, the economy of Cilician Armenia progressed greatly and became heavily integrated with Western Europe.