By 1632 Poussin had been elected a member of the Guild of St. Luke in Rome, a mark of official recognition that provides evidence of his growing reputation. In the early 1630s his art also underwent a fundamental change of direction. Rejecting the seductive attractions of Venetian painting—with its lustrous colour and vibrant brushwork—he adopted instead a more severe and cerebral style that emphasized clearly delineated and modelled forms and cold, pure colours. His compositions also became more rigorously ordered, with the figures often arranged in a friezelike manner parallel to the picture plane, in the style of an ancient relief. The order and complexity of this new style led Poussin increasingly to rely on making detailed preparatory drawings for his pictures. The Adoration of the Magi of 1633 serves as a manifesto of his artistic conversion and is unashamedly modeled after an earlier work on this theme by the greatest Classical master of the Renaissance, Raphael.

With his reputation with collectors significantly improving, in 1635–36 Poussin secured a major commission from Cardinal Richelieu, first minister to Louis XIII of France, for a series of bacchanals to adorn the cardinal’s château outside Paris. Other prestigious commissions soon followed. Beginning in the late 1630s, Poussin executed an important work for the king of Spain, Philip IV, and for Pozzo the Seven Sacraments, a set of paintings representing rites of the early Christian church. In 1638 he painted The Israelites Gathering the Manna for Paul Fréart de Chantelou, who subsequently became his closest friend and greatest patron. This work is the most ambitious history painting of Poussin’s entire career and, by the artist’s own admission, was designed to be “read” by the viewer, with every figure, episode, and action intended to contribute to the drama. This intensely intellectual approach to painting—which aimed to encapsulate a complex sequence of events into a single static image—would eventually earn Poussin the epithet of “painter-philosopher.”

“The Raphael of our century”

Early in 1639 Poussin was invited to Paris to work for King Louis XIII. Initially reluctant to be uprooted from Rome, he was repeatedly pressured by Richelieu to heed the king’s command and eventually arrived in the French capital in December 1640. The next 18 months or so were among the unhappiest of the artist’s career. Named First Painter to the King upon his arrival in Paris, Poussin was entrusted with the decoration of the royal residences, executing designs for the Long Gallery of the Louvre, painting altarpieces for the king and members of his court, and even designing book illustrations. Much of this work was carried out with a team of assistants—a method of working that Poussin found deeply inimical to his creative integrity and independence. Frustrated by the range and diversity of the king’s commands, Poussin eventually secured permission to return to Rome in 1642, ostensibly to fetch his wife. The death of Richelieu in December of that year and of the king himself four months later absolved Poussin of ever returning to the French court, leaving the artist to spend the rest of his years in Rome.

Commissions from French patrons dominated the second half of Poussin’s career. The most important of these was for a second Seven Sacraments set of paintings, for Chantelou between 1644 and 1648, which is the central achievement of Poussin’s art. Reflecting the general development of his style during this period, these works were nobler and more monumental in conception than his earlier set for Pozzo and were intended to be more archaeologically accurate. In all of them, the scene is set in early Christian times, and Poussin sought to re-create the architecture, furniture, and costumes as they would have looked in the period. This principle of historical accuracy was subsequently codified by the French Academy into a doctrine of “decorum,” which had a lasting impact upon later history painting, especially during the Neoclassical period.

In 1647 Poussin outlined another theoretical principle that was to be crucially important for future generations of artists, particularly in the 19th century: his so-called “theory of the modes.” Basing his ideas on the modes of ancient music, Poussin observed that all aspects of a painting should be chosen to arouse an emotion in the viewer that is appropriate to the subject. Thus, severe themes should look grave and joyous ones uplifting. The implication of that theory is that the basic elements of painting—line, form, and colour—can themselves be entrusted to appeal directly to the emotions. Poussin certainly applied that principle throughout much of his career, typically employing discordant colour harmonies for tragic themes and seductive ones for tender and lyrical subjects. The repercussions of that theory extended far beyond his oeuvre, however, for the notion that the rudiments of painting are themselves inherently capable of arousing emotion is fundamental to the evolution of abstract art.

The later years of the 1640s constitute the high point of Poussin’s career, when he created some of his noblest figure paintings, among them Eliezer and Rebecca, The Holy Family on the Steps, and The Judgment of Solomon. In all of those the artist integrated the figures with their setting in a strict and uncompromising manner that resulted in scenes that are not only conceived in depth but also highly unified across the two-dimensional surface of the picture. The visual tensions between space and surface design generated in those works make them among the most austere creations of the artist’s career, but they also possess a splendour and finality that rank them among the very greatest masterpieces of Classical art. “I have neglected nothing,” declared Poussin, when questioned later in life on how he had attained such perfection in painting.

In 1648 Poussin embarked upon a series of landscape paintings that was destined to become a cornerstone of the Classical landscape tradition. The majority of those incorporate themes from ancient history and mythology, though some are without an identifiable literary subject. In all of them an intensely idealized view of landscape is combined with architecture, contrasting the “irregular” forms of the natural world with the geometrically perfected shapes of human devising. Among the most heroic works of that period are the pendant compositions illustrating the story of Phocion. In the first of these, Poussin portrays the body of Phocion being carried out of Athens in a landscape of unparalleled grandeur and majesty, elevating that traditionally “inferior” genre of painting to the level of his most exalted history pictures.

In 1649–50 Poussin also painted two self-portraits that show him dressed in the manner of the ancients, whose art he so much admired. Having attained the most Classical phase of his art at that point, it is fitting that he should have been described by one critic in 1650 as “the Raphael of our century.”