▁Greek ▁origin . ▁Or al ▁tradition ▁says ▁that ▁the ▁city ▁was ▁built ▁by ▁the ▁Rom ans ▁under ▁the ▁name ▁" C and ida ▁Latin orum " ▁( rem ains ▁of ▁Roman ▁aqu ed uct ). ▁Some ▁sch ol ars ▁believe ▁the ▁name ▁is ▁given ▁by ▁the ▁white ▁color ▁of ▁the ▁hill . ▁The ▁modern ▁town ▁dates ▁from ▁the ▁time ▁of ▁invas ions ▁Goth ic , ▁when ▁the ▁inhabitants ▁moved ▁from ▁the ▁valley ▁on ▁the ▁hill , ▁and ▁build ▁their ▁houses ▁around ▁the ▁temple ▁dedicated ▁to ▁Jup iter ▁( present ▁castle - Ch urch ▁mother ). ▁I ▁Lomb ard ▁the ▁fort ified ▁walls ▁inter sp ers ed ▁with ▁to wers . ▁Under going ▁the ▁various ▁domin ations ▁arrive ▁at ▁the ▁first ▁written ▁sources ▁of ▁the ▁XI - X II ▁sec . ▁The ▁pap al ▁b ull ▁Eugen ius ▁III ▁( 1 1 5 2 ) ▁decre ed ▁the ▁construction ▁of ▁the ▁churches ▁of ▁San ▁Don ato ▁( the ▁only ▁one ▁that ▁still ▁exists ), ▁San ▁Pietro , ▁San ▁Z ac car ia , ▁San ▁Greg orio . ▁Part icip ates ▁in ▁the ▁First ▁Cr us ade . ▁And ▁is ▁registered ▁in ▁the ▁Catalogue ▁of ▁the ▁Bar ons ▁with ▁th ir teen ▁nobles , ▁head ed ▁by ▁the ▁over l ord ▁Roger ▁Mar es cal co ▁to ▁particip ate ▁in ▁the ▁Third ▁Cr us ade ▁to ▁William ▁the ▁Good ▁( 1 1 8 8 – 1 1 9 8 ). ▁A ▁Roberto ▁R ip ac and ida ▁of ▁Frederick ▁II ▁in ▁charge ▁of ▁guard ing