“One day while Krishna was staying with the Pandavas, He and Arjuna prepared themselves to go to the forest to hunt. Both of them sat down on the chariot, which flew a flag with a picture of Hanuman. Arjuna's special chariot is always marked with the picture of Hanuman, and therefore his name is also Kapidhvaja. (Kapi means Hanuman, and dhvaja means ‘flag.’)” (Krishna, The Supreme Personality of Godhead, Vol 2, Ch 3)