Born in Genoa in 1617, Colloredo exhibited himself all over Europe because from his belly hung a parasitic twin that had one thigh, hands, body, arms, and even a well-formed head covered with hair. Lazarus was the name the complete twin was known by and his underdeveloped sibling was Joannes. It is highly unlikely that these were their giving names as Joannes Baptista translates to ‘John the Baptist’ in English. However, interestingly enough, it was the practice of the day to baptize both twins in a parasite or conjoined twin situation.
There were allegedly some faint signs that Joannes had some independent existence as movements of respiration were evident as were occasional rapid eye fluttering movements. The mouth of Joannes was said to be in a state of near constant salivation and Bartholinus himself wrote that he had seen the arms of Joannes move in response to stimuli. The genitals of Joannes were said to be ‘imperfect’ and it is unclear if any regular eliminations occurred.
The popularity and financial success of the twin "ensured that freak shows and human exhibition would be a worthwhile endeavour for managers and freaks alike."