Second half of the 18th century
Dimensions: W. 79 cm (2' 7'' ⅛) ; H. 97 cm (3' 2'' ¼ ) ; D. 4 cm (1'' ⅝ )
Cast iron
Positive identification of this coat of arms as being that of Louis Lepeletier, Marquis of Rosanbo is confirmed by the crown of the marquis, the mortar board and mantle of Président à mortier above the coat of arms.
Louis V Lepeletier, cousin of Louis-Michel Lepeletier, first Martyr of the French Révolution :
Louis Lepeletier, Marquis of Rosanbo :
Born in 1760 in Paris, descendant of Louis III Lepeletier,, Marquis de Rosanbo (1690-1770), lawyer of king Louis XIV in 1709 and adviser in Paris' Parlement in 1710, then first president of the Paris' Parlement between 1736 and 1743, Louis V Lepeletier de Rosanbo was a distinguished French Magistrate. In 1765, when he was only 18 years old, he was elected Président à mortier of the Parliament, one of the most important offices of French justice in the Ancien Régime. From then on, Louis Lepeletier de Rosanbo therefore included the mortar board, black velvet toque adorned with two golden braids, and the coat of the Président à mortier in ermine-lined scarlet within his traditional family coat of arms. It may therefore be considered without any doubt that the composition of the personal arms of Louis Lepeletier de Rosanbo as represented on this fireback was subsequent to 1765.
Suporter of the monarchy and most importantly of Louis XVI during his Revolution trial, he was guillotined in Paris with his wife Antoinette de Lamoignon de Malesherbes, his father-in-law Chrétien Guillaume de Lamoignon de Malesherbes and their daughter Aline with her husband Jean-Batiste de Chateaubriand, eldest brother of the writter, on Apris, 22 1794.

Louis III Lepeletier’s coat of arms
Source : Bibliothèque nationale de France, Département des manuscrits, Latin 9643 : Code théodosien (VIIe s.)

When residing in Paris, Louis Lepeletier lived in the mansion at 62-64 rue René-Boulanger in Paris, built in 1780 according to the plans of the architect Nicolas-Claude Girardin (1749 - 1786).
The manson in quoted in Mémoires d'outre-tombe by Chateaubriand.
The Lepeletier family is divided in many branches, of them is known for a Louis-Michel Lepeletier, comte de Saint-Fargeau, partisan of the French Revolution and first Martyr of the French Revolution (1760 - 1793).
Michel Lepeletier. Despite being a supporter of the abolition of the death penalty, for which he pronounces a famous speech in front the Assemblée Nationale in may 1791, he changes his mind when it's about Louis XVI's fate and vote for his execution on January, 20th 1793. On the very same evening, during a dinner where is also Philippe Nicolas Maris de Pâris, fervent royalist and old body guard of Louis XVI. A fight starts between the to men and Pâris kills Lepeletier with his sword.
true « martyr of the Révolution ». His body is exhibited during three days on the Place Vendôme in a spectacular staging invented by the painter Jacques-Louis David before being inhumed in the Panthéon in Paris.