Now it's fleshing out
Here's another old concept to show how old the customs of Italy are
Even muggles who aren't related to a wizarding family are protected from this misbehavior of magic born for they still hold titles and claim the control of territory

Noblesse oblige is a French phrase literally meaning "nobility obliges" is still a practice in Italy
 It is the concept that nobility extends beyond mere entitlements and requires the person with such status to fulfill social responsibilities, particularly in leadership roles.

Whoever claims to be noble must conduct himself nobly.
(Figuratively) One must act in a fashion that conforms to one's position, and with the reputation that one has earned.

With wealth, power, and prestige come responsibilities and applied more broadly to suggest a general obligation for the more fortunate to help the less fortunate.

In ethical discussion, it is sometimes used to summarize a moral economy wherein privilege must be balanced by duty towards those who lack such privilege or who cannot perform such duty. Finally, it is used primarily to refer to public responsibilities of the magically gifted rich, and powerful, notably to provide good examples of behavior or to exceed minimal standards of decency.

As you can see the system would be very complex and filled with pitfalls for the outsider.