Marquess of Saint-Floris (Markies van Sint-Floris / Marquis de Saint-Floris) was a French noble title, belonging to the Picardian nobility. Saint-Floris is a town in former Flanders.
The title was created in 1674 by king Louis XIV for the House of Ghistel. However, the Lords of Saint-Floris belonged to old Flemish nobility, their descendants were incorporated by the French Crown. The title belonged to the Spanish Grandeza.Nobiliaire universel de France: ou Recueil général des généalogies ..., Volume 4
Genealogic list Charles de Ghistelles x Barbe de La Plancque, Lady of Saint-Floris. Alexander de Ghistelles, Lord of Saint-Floris x Florence de Wissocq.Épigraphie du département de Pas-de-Calais, Volume 8/ Commission départementale des monuments historiques du Pas-de-Calais 1934 Adrian-François de Ghistelles, 1st Marques of Saint-Floris x Marie-Françoise de Wissocq, Lady of Erny. Philippe I Alexandre François de Ghistelles, 2nd Marquess of Saint-Floris x Marie-Isabelle de Crecquy Philippe II Alexandre Marie Joseph Antoine de Ghistelles, 3rd Marquess of Saint-Floris x Marie-Joseph de Hornes-Bassignies. Philippe III Alexandre Emmanuel François: 1st Prince de Ghistelles in 1760,Le Guide des châteaux de France: Pas-de-Calais, Jacques Thiébaut Hermé, 1986 - p. 70 4th Marquess of Saint-Floris x Louise-Elisabeth de Melun.
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