PCT4262017: Leonard de Vinci presents his painting La Mona Lisa (Mona Lisa, Monna Lisa) to Francois 1er who bought it 4000 gold guilders (15 kilos of gold) in 1517. Engraving on the cover of the illustrated supplement of the Petiure Journal n° 1206, 28/12/1913., French School, (20th century) / Bridgeman Images