en rang d'Oignon

This expression would come from the name of Artus de la Fontaine Solaro, Baron of Ognon, a small village in Oise (60810) and also Lord of Vaumoise. This nobleman was the organizer of festivities and ceremonies under the reign of four kings of France starting with Henry II, then successively under Francis II, Charles IX, and Henry III. He assigned their places to the lords according to their protocol ranks, which exasperated some of them who, then and in derision, considered themselves 'in the ranks of Ognon'.