Messidor (French pronunciation: [mesidɔʁ]) was the tenth month in the French Republican Calendar. The month was named after the Latin word messis, which means harvest. Messidor was the first month of the summer quarter (mois d'été). It started on 19 or 20 June. It ended on 18 or 19 July. It follows the Prairial and precedes the Thermidor. (Wikipedia).