From 1610 to 1617, Henry’s widow, Marie de Médicis, ruled on behalf of their young son Louis XIII (reigned 1610–43). Once more the security of the country was threatened as factions disputed around the throne. The work of Henry IV seemed likely to be undone. Crown and country, however, were rescued by probably the greatest minister of the whole Bourbon dynasty—Armand-Jean du Plessis, cardinal et duc de Richelieu. Richelieu first came to the attention of the government in 1614, when he was chosen to present the final address of the clergy at the meeting of the Estates-General. His eloquence and political expertise on this occasion won him the notice of Marie de Médicis, who later appointed him her secretary. By 1616 Richelieu was secretary of state for war and foreign affairs. His career, however, received a check in the following year when a palace revolution overthrew the regency of the queen mother, exiling her to Blois. Richelieu was banished first to Luçon and subsequently to Avignon (1618). He began the climb back to power by negotiating the Treaty of Angoulême (1619), which reconciled Louis XIII to his mother. After the death in 1621 of Louis’s favourite, Charles d’Albert, duc de Luynes, Richelieu regained effective power; he became a cardinal in 1622 and in April 1624 gained access to Louis XIII’s council. On the disgrace in 1624 of the superintendent of finance, Charles de La Vieuville, Richelieu became Louis’s principal minister—a position that he maintained until his death some 18 years later.

Richelieu proved an indefatigable servant of the French crown, intent on securing absolute obedience to the monarchy and on raising its international prestige. The first objective required him to crush a number of revolts of the nobles, the first of which, in 1626, involved the king’s younger brother and heir, Gaston, duc d’Orléans. Louis acted ruthlessly, and one of the conspirators, Henri de Talleyrand, comte de Chalais, was executed. Then, in 1630, came the notorious Day of Dupes (November 10), when the queen mother, now allied with Gaston and the keeper of the seals, Michel de Marillac, prepared to move against Richelieu. After initially agreeing to the cardinal’s dismissal, the king recovered and chose to support Richelieu against the wishes of his mother, his wife, and his confessor. Finally, at the very end of his life, the cardinal had to overcome another conspiracy headed by the young royal favourite, Henri Coiffier de Ruzé, marquis de Cinq-Mars, in which Gaston was once more implicated. Through all these crises, Richelieu retained the king’s support, for it was in Louis’s interests, too, that such intrigues be firmly dealt with.

In the course of strengthening royal absolutism, Richelieu also came into conflict with the Huguenots. He believed that their right under the Edict of Nantes to maintain armed fortresses weakened the king’s position at home and abroad. Protestant rebellions in 1625 and 1627 persuaded the cardinal of the need for a direct confrontation. The major Huguenot citadel of La Rochelle was attacked by royal troops in 1627 and, despite attempts by the English to assist the Protestants, fell in the following year. Another royal army marched into Languedoc, where the Huguenot forces were concentrated, and quickly overcame them. The Peace of Alais (1629) left the Huguenots free to enjoy religious and civil liberties, but they lost the military power that had made them a threat to the government. They were never to pose that sort of threat again, and little more would be heard of them until Louis XIV decided to repeal Henry IV’s Edict of Nantes.

Richelieu also took a great interest in economic matters. To promote economic self-sufficiency, he encouraged the manufacture of tapestry, glass, silk, linen, and woolen cloth. He gave privileges to companies that established colonies in the Americas, Africa, and the West Indies. To protect trading and colonial interests, he created a navy, which by 1642 had 63 oceangoing vessels.

On the basis of these policies, Richelieu was able to pursue an increasingly ambitious foreign policy. His first aim was the security of France, which he hoped to achieve through the occupation of key points on the country’s frontiers lying along imperial and Spanish territories. He thus involved France in the War of the Mantuan Succession (1628–31) in northern Italy. Through diplomatic means he worked for the dismissal of Albrecht Wenzel von Wallenstein, the brilliant general fighting on the side of Emperor Ferdinand II, whose forces were threatening to destroy the Protestant princes of Germany in the Thirty Years’ War. To undermine the power of the Habsburgs, he prolonged this conflict, negotiating with the United Provinces; with Gustav II Adolf of Sweden, with whom he concluded the subsidy Treaty of Bärwalde in 1631, agreeing to pay the Swedish king one million livres per year to continue the war; with Gustav’s successor, Greve (count) Axel Oxenstierna; and with Bernhard, duke of Saxe-Weimar. Eventually, in 1635, Richelieu committed France to direct conflict with the Habsburgs; and before his death he had savoured the triumph of having French arms in the Spanish Netherlands, Lorraine, Alsace, and Roussillon.

Richelieu’s foreign policy was not only ambitious but extremely expensive. Annual government expenditure tripled from 1620 to 1640, two-thirds of the money going to the military. The drastic increase in taxes needed to pay for the war sparked a series of provincial rebellions in the 1630s. The population’s resentment of the monarchy’s rising demands was exacerbated by the fact that these years marked the end of a long cycle of prosperity, encompassing most of the 16th century and the beginning of a period of economic difficulties that would extend through the reign of Louis XIV. Crop failures, great fluctuations in prices, and outbreaks of famine further accentuated the misery. Although most participants in the revolts of the 1630s came from the lower classes, municipal authorities such as those of Lyon in 1632, provincial nobles in Périgord in 1636, and even princes of the blood such as Louis de Bourbon, comte de Soissons, in 1641, took advantage of the discontent to incite protests against the increasing centralization of royal power and Richelieu’s efforts to abrogate local privileges. Indeed, peasants often turned to local nobles to lead their movements.

Although these revolts were unwelcome distractions from the minister’s efforts to project French power abroad, they did not pose a revolutionary threat. Dispersed and uncoordinated, they were put down by a combination of temporary concessions, such as the suspension of efforts to collect unpopular taxes, and the exemplary execution of a few ringleaders. There was little sign of the revolutionary attitude that had characterized aspects of the 16th-century Wars of Religion and that would surface again in 1789. On the contrary, there were positive signs of continuing loyalty to the crown, with such rebel slogans as "Vive le roi sans la gabelle" (“Long live the king, but not the salt tax”) or "Vive le roi sans la taille" (“Long live the king, but not the direct tax”) indicating that the resistance was focused on the taxes themselves. Nor was the other great bastion of the establishment, the church, attacked. The substantial tax of the dîme (the tithe, or tenth) continued to be paid to the church without complaint. The first half of the 17th century was a period of revival for French Catholicism, as the church reforms called for by the Council of Trent began to show their effects. Improved seminary training produced more educated and devout priests, who worked to inspire stricter observance among their flocks. New religious orders, inspired by such figures as Francis of Sales, Vincent de Paul, Jane Frances of Chantal, and Louise de Marillac (all later canonized), emphasized practical activities such as teaching and the provision of medical care. These orders—such as the Oratorians and the Vincentians (Lazarists), for men, and the Ursulines and Sisters of Charity, for women—rooted the church more strongly in French society.

The career of Richelieu bears something of a contradictory aspect. He undoubtedly added to the earlier success of Henry IV and Sully in overcoming the threat of anarchy and disorder that was the legacy of the late 16th century. Indeed, his contemporary reputation was one of supreme ruthlessness and arbitrariness in the application of power. Yet he was never more than the king’s creature, incapable of pursuing a course of action of which Louis disapproved, always vulnerable to the loss of royal favour and support. He was ambitious, but he recognized that his desire for power could be satisfied best within the confines of dutiful royal service. Richelieu was no innovator: he devised neither new administrative procedures nor novel methods of taxation to secure the king’s authority. Indeed, the power of the great financiers grew with the government’s need for additional war revenue, posing a different threat to royal absolutism. Richelieu’s unique contribution lay in the single-minded devotion he gave to the task of increasing royal authority at home and abroad. He also succeeded in accumulating a vast personal fortune as a result of his years in power. Richelieu died in 1642, and Louis XIII died the following year. France was once again ruled by a regent, the queen mother, Anne of Austria. But the task of governing the country fell increasingly into the hands of another cardinal, Jules Mazarin.