Islam arrived in Albania mainly during the Ottoman period when the majority of Albanians over time converted to Islam. Following the Albanian National Awakening (Rilindja) tenets and the deemphasizing of religion during the 20th century, the democratic, monarchic, and later the communist governments followed a systematic dereligionization of the Albanian nation and national culture. Due to this policy, Islam, as with all other faiths in the country, underwent radical changes. Decades of state atheism, which ended in 1991, brought a decline in the religious practice of all traditions. The post-communist period and the lifting of legal and other government restrictions on religion allowed Islam to revive through institutions that generated new infrastructure, literature, educational facilities, international transnational links and other social activities. According to a 2011 census, 56.7% of Albania's population adheres to Islam, making it the largest religion in the country. For contemporary Muslims in Albania, Muslim religious practices tend to be minimal. The remaining population belongs either to Christianity, which is the second largest religion in the country practiced by 16.99% of the population, or are irreligious. Albania came into contact with Islam in the 13th century when Angevin expansion into Albania during the reign of Charles I Anjou was made possible in part by Muslim involvement. Lucera is located only about 240 km northwest of Brindisi, which was the main port of disembarkation. Charles claimed rights in Albania, as Manfred's successor, since 1267 when the Treaty of Viterbo was drawn up. During the winter of 1271, the Angevin forces took Durrës. Within a year, Charles began to use the title "rex Albaniae", a title that was later recognized by the king of Serbia and the tsar of Bulgaria. In 1273 both Muslim and Christian contingents sailed across the Adriatic. In April 1273, a Muslim from Lucera named Leone was appointed captain of the Muslim forces in Durrës.