Which king commissioned the expansion of the Palace of Versailles?

Louis XIV commissioned the expansion of the Palace of Versailles.

Versailles began as a hunting lodge and smaller château associated with Louis XIII, but his successor transformed it into a monumental royal residence. Louis XIV ordered major renovation and expansion from 1661 onward, initially employing architect Louis Le Vau, landscape designer André Le Nôtre, and decorator Charles Le Brun. Their work turned the site into a grand expression of royal authority.

After the Treaty of Nijmegen in 1678, Louis XIV intensified the project and appointed Jules Hardouin-Mansart as First Architect. Mansart added the Hall of Mirrors, the Ministers' Wings, major service buildings, and later the north and south wings that housed the expanding court. The palace was largely complete by Louis XIV's death in 1715.

Louis XV and Louis XVI made later changes, especially to interiors, but they did not initiate the defining transformation of Versailles. Louis XIII was connected with the original château, while Louis XV and Louis XVI were later occupants. Louis XIV officially moved the court and government to Versailles in 1682, making the palace a political instrument as well as an architectural masterpiece.