 Contemporary chronicler William of Tyre recorded the census of 1183, which was intended to determine the number of men available to defend against an invasion, and to determine the amount of tax money that could be obtained from the inhabitants, Muslim or Christian.If the population was actually counted, William did not record the number.In the 13th century, John of Ibelin drew up a list of fiefs and the number of knights owed by each, but this gives no indication of the non-noble, non-Latin population.