One writer, called the Anonimo Gaddiano, claims that in 1480 Leonardo was living with the Medici and working in the Garden of the Piazza San Marco in Florence, a Neo-Platonic academy of artists, poets and philosophers that the Medici had established.
In January 1478, he received an independent commission to paint an altarpiece for the Chapel of St.
A painting by Leonardo, Salvator Mundi, sold for a world record 0.3 million at a Christie's auction in New York, 15 November 2017, the highest price ever paid for a work of art.
Nevertheless, these few works, together with his notebooks, which contain drawings, scientific diagrams, and his thoughts on the nature of painting, compose a contribution to later generations of artists rivalled only by that of his contemporary, Michelangelo.
Sometimes credited with the inventions of the parachute, helicopter and tank, he epitomised the Renaissance humanist ideal.
Many historians and scholars regard Leonardo as the prime exemplar of the "Universal Genius" or "Renaissance Man", an individual of "unquenchable curiosity" and "feverishly inventive imagination", According to art historian Helen Gardner, the scope and depth of his interests were without precedent in recorded history, and "his mind and personality seem to us superhuman, while the man himself mysterious and remote".
His father had married a sixteen-year-old girl named Albiera Amadori, who loved Leonardo but died young in 1465 without children.
Close examination reveals areas that have been painted or touched-up over the tempera using the new technique of oil paint; the landscape, the rocks seen through the brown mountain stream and much of the figure of Jesus bearing witness to the hand of Leonardo.
In 1478, he left Verrocchio's studio and was no longer a resident at his father's house.
Seventy tons of bronze were set aside for casting it.
The monument remained unfinished for several years, which was not unusual for Leonardo.