Ingenui or ingenuitas (singular ingenuus), was a legal term of ancient Rome indicating those freemen who were born free, as distinct from, for example, freedmen, who were freemen who had once been slaves.
In ancient Rome, free men were either ingenui or libertini. Ingenui indicated those free men who were born free. Libertini were those men who were manumitted from legal slavery. Although freedmen were not ingenui, the sons of libertini were ingenui.
According to Cincius, in his work on Comitia, quoted by Festus, those who in his time were called ingenui, were originally called patricii
Collegia could function as guilds, social clubs, or burial societies; in practice, in ancient Rome, they sometimes became organized bodies of local businessmen and even criminals, who ran the mercantile/criminal activities in a given urban region, or rione.
By law, only three persons were required to create a legal collegium; the only exception was the college of consuls, which included only the two consuls.
The Ancient Greek term for collegium is hetaireia and such organizations existed, from as early as the 6th century BCE in Athens.
Also check this for mancipium, which means slave or property. And possibly Chattel.
Here is Corporatus (Corporati)
And an article on Slavery in Ancient Rome
Also keep in mind the distinctions between "Patricians", versus Equites.
And check this out, Captie censi, of which captie being 'head' and censi being 'assess'.