Social policy in the political philosophy during the time of the Kingdom of Jerusalem
XII-XIII centuries, the age of the Crusades - is the period of the most active development of the social support practices in the Medieval Europe, which afterwards became a foundation for the emergence of the social policy in the XIX-XX centuries. In this time the scholastic philosophy blossoms, which gained access to Ancient Greek texts in Arabic translation. Acquaintance with Byzantine practices of charity and Byzantine law also contributed significantly to the development of the political and legal ideas in Europe. The aim of the present article is to compare political philosophy of the Latin West, Byzantine, Arab and Jewish thinkers and point out the main ideas, related to the problems of charity, which afterwards expressed themselves in administrative solutions for organisation of the social support. The article relies on the comparative and historical approach, analysis of institutions and legal documents and presents the reasoning in the social philosophy of several key thinkers of the time when the Kingdom of Jerusalem existed. Thanks to the Arab thinkers Europe could use the heritage of Aristotle, and reception of the Byzantine legal and institutional norms allowed to give a new impulse to the development of the social support in Europe. The presented information on development of the political philosophy in the age of the Kingdom of Jerusalem is valuable for studies on charity, self-organisation, social policy, history of political philosophy.