He led a band of monkeys, or ape-like creatures, who gave very important aid to Rāma from the rescue of Sītā from Rāvaṇa's kingdom of Laṅkā. He's a image of toughness and loyalty, which is patron of wrestlers. The Panchamukhi Hanuman Kavach is also greatly listened to and meditated https://www.youtube.com/watch?v=ufkmD95y7fE