Leonardo Da Vinci really first became an artist in the year 1469. Leonardo worked in the workshop of Verocchio, but was quickly a better artist then him. In his eraly twenties, Leonardo was already incredibly famous.
The Mona Lisa was Da Vinci's most famous paintings and might even be the most famout painting in the world. It was painted on poplar wood in the 16th Century. On August 21st 1911 the Mona Lisa was stolen. It was stolen on a Monda, but nobody noticed it was gone until noon the next day.
Some people who have studied the Mona Lisa for a very long time, actually saw a resemblance between Mona Lisa and Leonardo Da Vinci. Some say it is actually a self portrait of himself. It will never be known for sure.
To this day, The Mona Lisa has a room of its own in the Louvre and will most likely never be stolen again.