After the death of the Louis XIV in 1715, the five-year old king Louis XV, the court, and the Regence government of Philippe d'Orleans returned to Paris. In May 1717, during his visit to France, the Russian czar Peter the Great stayed at the Grand Trianon. His time at Versailles was used to observe and study the palace and gardens, which he later used as a source of inspiration when he built Peterhof on the Bay of Finland west of Saint Petersburg. During the reign of Louis XV, Versailles underwent transformation, but not on the scale that had been seen during the reign of Louis XIV. When the king and the court returned to Versailles in 1722, the first project was the completion of the Salon d'Hercule, which had been begun during the last years of Louis XIV's reign but was never finished due to the king's death.