Wikipedia
Vishvaksena
Vishvaksena or Vishwaksena, also known as Sena Mudaliar and Senadhipathi (all literally "army-chief"), is the commander-in-chief of the army of the Hindu god Vishnu and the gate-keeper and "chamberlain" of Vishnu's abode Vaikuntha. Vishvaksena is worshipped before any ritual or function in some Vaishnava sects. He occupies an important place in Vaikhanasa and Sri Vaishnava temple traditions, where often temple festivals begin with his worship and procession.