When you are king, in this case, Francis 1, only the most famous artist of the time is good enough to decorate your palace walls.
Galerie François I at Fontainebleau: one of the great interiors of the Renaissance. Decorated by a team of Italian artists including Francesco Primaticcio
Francesco Primaticcio, also called Bologna, Le Primatice, or Primadizzi, (born April 30, 1504, Bologna, Emilia [Italy]—died 1570, Paris, France), Italian Mannerist painter, architect, sculptor, and leader of the first school of Fontainebleau.
Apollo & the muses, in the ballroom at Fontainebleau by Francesco Primaticcio
Now a staircase but formerly the chamber of Anne de Pisselieu, Duchesse d'Etampes, Francois I's #1 mistress. Decorated in the 1540s with frescoes & amazing stucco figures by Primaticcio,
Ulysses and Penelope, painted in 1545
After Primaticcio worked with Giulio Romano on decorations at Mantua's Palazzo del Tè, François I invited him to his palace at Fontainebleau in 1532. Aside from royal art-buying trips to Italy, Primaticcio remained there as court artist under François I, Henri II, and François II. His responsibilities ranged from planning interior decoration to serving as architect in the design of entire buildings. His versatility also extended to painting, supervising tapestry production, and creating designs for court masques and other celebrations. At Fontainebleau, Primaticcio worked closely with Rosso Fiorentino, introducing Italian Mannerist features into French decorative art. Their distinctive combination of painting and stucco relief became a hallmark of the School of Fontainebleau. After Rosso's death in 1540, Primaticcio became chief designer. He completed his masterpiece, the Ulysses Gallery, between the late 1630s and 1659. Throughout the 1500s, Primaticcio's elongated, elegant figure-drawing style greatly influenced French painting. His architectural work was equally influential but because many of the buildings he worked on have been destroyed, a record of this body of work often survives only in prints and drawings.
Two-faced. Double head, 1543
https://www.britannica.com/biography/Francesco-Primaticcio