He was born in Milan the September 29th, 1571.
In his life, he had some style. One of the first one valued simplicity and attention to naturalistic detail and was closer to the naturalism of Germany than to the stylized formality and grandeur of Roman Mannerism.
He ameliorates this style to become one of the most realistic one of that time… At the limit, with his painting he surprises.
The answer why he painted the most realistic as possible is: “He preferred to paint his subjects as the eye sees them, with all their natural flaws and defects instead of as idealised creations.” (Wikipedia)
He painted a lot of religious portrait or scene like: David with the Head of Goliath (1609–1610), The Taking of Christ (1602), The Entombment of Christ (1602–1603), and many other one.
He was considered as the cutting edge for the young artists of that time.
There are about 80 oeuvres of Caravaggio that survive with time, they are placed in different museum in the world.
"Michelangelo Merisi, son of Fermo di Caravaggio - in painting not equal to a painter, but to Nature itself - died in Port' Ercole - betaking himself hither from Naples - returning to Rome - 15th calend of August - In the year of our Lord 1610 - He lived thirty-six years nine months and twenty days - Marzio Milesi, Jurisconsult - Dedicated this to a friend of extraordinary genius." (Inscriptiones et Elogia (Cod.Vat.7927))