Four Principal Samhitas
चतुःसंहिताः
The Vaikhanasa tradition traces to the sage Vikhanas (a form of Brahma). Its four principal Samhitas are attributed to Vikhanas' four disciples: Marichi, Atri, Bhrigu, and Kashyapa. Together they form the complete Vaikhanasa Agama corpus — the ritual system used in major temples including Tirupati Balaji (Venkateswara).