Beloved for their grace, strength, and untamed beauty, horses have always loomed large in our imaginations, featuring in mythologies across cultures and throughout history. This little encyclopedia rounds up more than 50 mythical horses from around the world, including: Bai Long Ma, part dragon and part horse, of the Chinese classic Journey to the West; Balius and Xanthus, Achilles's horses who fought in the Trojan War; Pegasus, a winged stallion and child of the Greek god Poseidon; Sleipnir, a war horse belonging to great Norse god Odin.