Which artist was known as the king of portrait?

Portrait painting is a genre in art where the primary focus is on the human subject. The face, expression, personality and even the inner essence of the model are often captured by the artist in the greatest portraits. Detailed knowledge of anatomy and light as well as interest in how humans register emotions are often key factors in executing a successful portrait. Many of the best known artists in history including, King Of Portrait: Leonardo da Vinci and Pablo Picasso explored the genre of portraiture. 17th century Dutch artist Rembrandt van Rijn is perhaps the greatest master in the genre of group portraiture while 20th century Mexican artist Frida Kahlo is the most renowned painter of self portraits. Here are the 10 most famous portrait paintings including Girl with a Pearl Earring, Portrait of Madame X, Mona Lisa and Arnolfini Portrait.