Europe across the period from 1000–1500 was characterised by a multiplicity of polities, but the majority were unified by membership of the Catholic Church. Indeed Latin Christendom (those polities that recognised papal authority and followed the Latin liturgy) doubled in size by the end of the twelfth century, as frontiers were pushed forward in the Holy Land, Sicily, the Iberian peninsula and the Baltic. This was generally achieved by extraordinary multi-polity coalitions loosely under the direction of the papacy, which confronted enemies of another faith and culture who seemed to present a military and existential threat to Christendom itself. Inter-polity conflict was nevertheless waged within Latin Christendom throughout the period, and especially after the collapse of Latin power in the Holy Land in 1291. As rulers focused more attention on nearby adversaries, they increasingly raised armies by contract for pay, aided by systems of credit, enabling the professionalisation of armies, to a limited extent. Meanwhile, throughout the period, securing divine support was considered important as military means in achieving strategic goals. The strategy and means of political–military elites are revealed through an increasing abundance of sources, notably chronicles and, particularly from the turn of the thirteenth century, an abundance of government records.