▁on ▁the ▁nin th ▁book ▁of ▁Rh az es . ▁He ▁remained ▁at ▁Le u ven ▁for ▁a ▁while , ▁before ▁leaving ▁after ▁a ▁dispute ▁with ▁his ▁professor . ▁After ▁sett ling ▁briefly ▁in ▁Ven ice ▁in ▁ 1 5 3 6 , ▁he ▁moved ▁to ▁the ▁University ▁of ▁Pad ua ▁( Univers itas ▁artist ar um ) ▁to ▁study ▁for ▁his ▁medical ▁doctor ate , ▁which ▁he ▁received ▁in ▁ 1 5 3 7 . ▁ ▁Medical ▁career ▁and ▁accomplish ments ▁On ▁the ▁day ▁of ▁his ▁gradu ation ▁he ▁was ▁immediately ▁offered ▁the ▁chair ▁of ▁surg ery ▁and ▁an atom y ▁( exp lic ator ▁ch ir urg iae ) ▁at ▁Pad ua . ▁He ▁also ▁guest - lect ured ▁at ▁the ▁University ▁of ▁Bolog na ▁and ▁the ▁University ▁of ▁P isa . ▁Prior ▁to ▁taking ▁up ▁his ▁position ▁in ▁Pad ua , ▁V es al ius ▁tra ve led ▁through ▁Italy , ▁and ▁assist ed ▁the ▁future ▁Pope ▁Paul ▁IV ▁and ▁Ign ati us ▁of ▁Lo y ola ▁to ▁he al ▁those ▁aff lic ted ▁by ▁le pro s y . ▁In ▁Ven ice , ▁he ▁met ▁the ▁illustr ator ▁Johan ▁van ▁Cal car , ▁a ▁student ▁of ▁Tit ian . ▁It ▁was ▁with ▁van ▁Cal car ▁that ▁V es al ius ▁published ▁his ▁first ▁an atom ical ▁text , ▁Tab ula e ▁An atom ica e ▁Sex , ▁in ▁ 1 5 3 8 . ▁Pre viously ▁these ▁topics ▁had ▁been ▁taught ▁primarily ▁from ▁reading ▁classical ▁texts , ▁mainly ▁Gal