Short for Urban II., former Odo de Châtillon, Odo de Lagery or Eudes de Châtillon, also Eudes de Lagery, Otto
von Lagery, Otto von Châtillon, Bischof Otto von Ostia (*1035; †1099) was pope from 1088 to 1099.
1095 he started liberating Jerusalem from
Islam by crusade. For this great accomplishment there was even a
dictionary named after him.