 Evidence even indicates alterations to Frankish cultural and social customs regarding hygiene (notorious amongst Arabs for their lack of washing and knowledge of bathhouse culture), going so far as to ensure water supplies for domestic use in addition to irrigation.It is impossible to give an accurate estimate of the population of the kingdom.Josiah Russell calculates that all of Syria had about 2.3 million people at the time of the crusades, with perhaps eleven thousand villages; most of these, of course, were outside of crusader rule even at the greatest extent of all four crusader states.