Vaiśravaṇa (tib. Dzambala) is a worldly Dharma Protector and is one of the Four Great Kings. He is the Guardian of the Northern direction and, in the temples, he is often represented on the wall near the main gate.
He is also considered as a deity of wealth ; emanation of Chenrezi. He manifests himself to bring relief to sentient beings; as the giver of material (and spiritual) wealth, he allows them to be free to focus on the spiritual path.
In traditional iconography he appears with a big body, a prominent belly, adorned with jewels and in a royal posture, a symbol of his frredom from samsara.
He holds in his right hand a fruit of the Jambhara tree (a symbol of accomplishments) and a mongoose in his left hand (a symbol of auspiciousness), with its mouth filled of precious gems. His right foot stands on a conch (a symbol of victory over the world), and he rides a snow lion.
Sources : Espace bouddhiste tibétain & Wikipedia
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