Iyers are Telugu or Tamil Brahmins of Hindu religion. Followers of the Advaita philosophy propounded by Adi Shankara, the Iyers reside in Tamil Nadu, and other parts of Andhra Pradesh, Kerala and Karnataka. Besides the surname of Iyer, these people use Sāstri, or Bhattar as their last names. Rituals followed during an Iyer Marriage are traditional and written in their scriptures. A typical Iyer Matrimony involves the bride and the groom sitting during the prayers and observing the varied sacred rituals to become husband and wife.