The Arabian horse is a breed of horse with a reputation for intelligence, spirit, and stamina. With a distinctive head shape and high tail carriage, the Arabian is one of the most easily recognizable horse breeds in the world. It is one of the oldest horse breeds, with archaeological evidence of horses that resemble modern Arabians dating back 4,500 years. Throughout history, Arabian horses from the Middle East spread around the world by both war and trade, used to improve other breeds by adding speed, refinement, endurance, and good bone. Today, Arabian bloodlines are found in almost every modern breed of riding horse.