Marie Anne de La Trémoille, Princesse des Ursins (1642 – December 5 1722) wis a French noblewoman born intae the La Trémoille faimily, she mairit in Februar 1675 she mairit Flavio Orsini (1620-1698) Prince Orsini, head o the Hoose o Orsini, Prince o Nerola an Duke o Bracciano, but known as the Prince Orsini. As a result o the mairiage shge wis known as the Princesse des Ursins in Fraunce, an as Princesa de los Ursinos in Spain. She is known for her being the de facto ruler o Spain frae 1701 until 1714 as a lady-in-waiting tae Queen Maria Luisa she also haed great influence over the queen. She wis also a friend o Madame de Maintenon. She wis also present at the birth o The Prince o Asturias in 1707