Christianity in the 11th century when the Seljuk Turks closed Christian pilgrimages and assailed the Byzantines, defeating them at the Battle of Manzikert. Emperor Alexius I asked for aid from Pope Urban II for help against Islamic aggression. Urban II called upon the knights of Christendom in a speech made at the Council of Clermont on 27 November 1095, combining the idea of pilgrimage to the Holy Land with that of waging a holy war against infidels. The First Crusade captured Antioch in 1099 and then Jerusalem. A traditional numbering scheme for the crusades totals nine during the 11th to 13th centuries. Elements of the
Simon II of Clermont less independently, e.g. Château de Clermont in Loire-Atlantique, Isère and Haute-Savoie, and some that have been destroyed. See also List of châteaux in Picardy. " This article incorporates information from the French Wikipedia." " This article incorporates information from the Dutch Wikipedia." Simon II of Clermont Simon II of Clermont-Nesle (c. 1210 – 1285/86) was Seigneur (Lord) of Ailly, Maulette and Nesle (in Picardy) . Note that there is a great confusion of names and titles within this family and with people with the same or similar names, as with many other medieval lords because of contradictory and incomplete documents.