Guy Andre de Laval Montmorency, Marquis de Laval Lazay

Guy-André de Montmorency-Laval (21 October 1686 – 7 March 1745), Marquis of Lezay and Magnac, Baron of La Marche, was a French aristocrat.

Early life Guy-André was born on 21 October 1686. Like all the elders of the Laval and Montmorency family, his baptismal name was Guy, and he was referred to as a "Count of Laval" before any other title. He was the son of Pierre III de Laval-Montmorency (–1687), and Marie Thérèse Françoise de Salignac (d. 1726), Marquise of Magnac, Countess of Fontaines-Chalandray.

His paternal grandparents were Guy-Urbain de Laval-Montmorency, Baron of la Plesse, known as the Marquis de Laval-Lezay, and Françoise de Sesmaisons. His maternal grandparents were Antoine de Salignac, Marquis of Magnac and Lamothe-Fénelon, and Catherine de Montbéron.

Career Montmorency was First Colonel of the Mortemart regiment, formerly Conflans. He was injured by a musket shot on 15 October 1715, at the siége of Fribourg. In all the letters and commissions he received from the King, he regarded him as a cousin. His role in the plot was referenced in the memoirs of Baroness de Staal, the correspondences of Madame la Duchesse d'Orléans, the memoirs of Marshal Claude de Villars and the memoirs of the Duke of Saint-Simon.

Personal life In 1722 Montmorency married Marie-Anne de Turménies de Nointel (1684–1756), the widow of Mathieu de La Rochefoucauld, Marquis of Bayers. (From her marriage to Mathieu de La Rochefoucauld, Marquis of Bayers (1660–1721), she was mother to (i) Marie Louise Françoise de La Rochefoucauld (1713–1791) — wife of Count Léopold Gabriel Christophe François Le Prud'homme (1700–1767), de Fontenoy and Count Christophe François Louis Le Prud'homme, de Fontenoy — and (ii) Mathieu-Roch de La Rochefoucauld (1714–1749), Marquis of Bayers.) Their children were: Louis-Joseph de Montmorency-Laval (1724–1808), the Bishop of Condom, Metz and Orléans who was made a Cardinal by Pope Pius VI in 1789. Guyonne-Marie-Christine de Montmorency-Laval, who married Henri-François de Grave, Marquis of Grave, in 1740. Marie-Anne de Montmorency-Laval (1725–), who married the Belgian Duke Hyacinthe-François de Looz-Corswarem.

He died in Paris on 7 March 1745. His widow died on 17 November 1766.