Despite being legally an adult for more than two years, Louis XIII had little power in the government; finally, he asserted his authority the next year. Feeling humiliated by the conduct of his mother, who monopolized power, the King organized (with the help of his favorite the Duc de Luynes) a coup d'état (also named Coup de majesté) on 24 April 1617: Concino Concini was assassinated by the Marquis de Vitry, and Marie exiled to the Château de Blois. Revolt of 1619 and Return From Exile In the night of 21–22 February 1619, the 43-year-old Queen Mother escaped from her prison in Blois with a rope ladder and by scaling a wall of 40 m. Gentlemen took her across the Pont de Blois and riders sent by the Duc d'Épernon escorted Marie in his coach. She took refuge in the Château d'Angoulême and provoked an uprising against her son the King, the so-called "war of mother and son" (guerre de la mère et du fils). A first treaty, the Treaty of Angoulême, negotiated by Richelieu, calmed the conflict. However, the Queen Mother was not satisfied and relaunched the war by rallying the great nobles of the Kingdom to her cause ("second war of mother and son"). The noble coalition was quickly defeated at the Battle of Ponts-de-Cé (7 August 1620) by Louis XIII, who forgave his mother and the princes. Aware that he could not avoid the formation of plots as long as his mother remained in exile, the King accepted her return to court. She then returned to Paris, where she worked on the construction of her Luxembourg Palace. After the death of the Duc de Luynes in December 1621, she gradually made her political comeback. Richelieu played an important role in her reconciliation with the king and even managed to bring the queen mother back to the Conseil du Roi. Artistic patronage From the time of her marriage to Henri IV, the Queen practiced ambitious artistic patronage, and placed under her protection several painters, sculptors and scholars. For her apartments at the Palace of Fontainebleau, the Flemish-born painter Ambroise Dubois was recruited to decorate Marie's cabinets with a series of paintings on the theme of the Ethiopics of Heliodorus, and painted for her gallery an important decoration on the theme of Diana and Apollo, mythological evocations of the royal couple. In the Louvre, the Queen had a luxurious