what does anticamera pontificia mean?
Did these people use to the the Sediari and the Noble guard? I read that when the Sedia was dumped by John Paul II (another one of his big mistakes), the men who used to carry the chair were given new duties. Like ushers and valets.
These are Gentlemen of His Holiness the Pope. It is the highest honour the Holy See can bestow on a layman, as these Papal Gentlemen are members of the pontifical household. Some are nobles, others are not. It is not a hereditary office, though many European families will have several recipients of this prestigious honour.