E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Margherita di Valois
married Henri the Béarnais, afterwards Henri IV. of France. During the wedding solemnities, Catherine de Medicis devised the massacre of the French Protestants, and Margherita was at a ball during the dreadful enactment of this device. (Meyerbeer: Gli Ugonotti, an opera.)