The Nāgas would be the followers of Virūpākṣa (Pāli: Virūpakkha), one of the 4 Heavenly Kings who guards the western course. They act as guards upon Mount Sumeru, protecting the dēvas of Trāyastriṃśa from assaults by the asuras. In Thailand and Java, the nāga is actually a wealthy underworld deity. https://128.199.208.170/