In 1513 Leonardo went to Rome, attracted by the patronage of the newly elected Medici pope, Leo X, and his brother Giuliano. Here he found the field dominated by Michelangelo and Raphael. The aging master was assigned to various architectural and engineering projects at the Vatican and received commissions for several paintings. It was perhaps in this period that he executed the enigmatic painting of the young St. John the Baptist (Louvre). Giuliano de' Medici left Rome in 1515 and died at Fiesole in the following year.
It is conjectured that Leonardo left with him, attached to his household, and that soon afterward he accepted an invitation of Francis I of France to settle at the castle of Cloux, near Amboise. Here the old master was left entirely free to pursue his own researches until his death. Although there is no certain record of his last years, he seems to have been active with festival decoration and to have been interested in a canal project. Notes and drawings ascribed to this late period show his continued interest in natural philosophy and experimental science.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.