Young Leonardo received little formal education beyond basic reading, writing and mathematics instruction, but his artistic talents were evident from an early age. Around the age of 14, da Vinci began a lengthy apprenticeship with the noted artist Andrea del Verrocchio in Florence. He learned a wide breadth of technical skills including metalworking, leather arts, carpentry, drawing, painting and sculpting. His earliest known dated work—a pen-and-ink drawing of a landscape in the Arno valley—was sketched in 1473.