Kavasa Ailusa or Kavasa the son of Ilusa is an interesting story about a Vedic seer who was banished from the community of sages. The story is found in Aitareya Brahamana.
Kavasa was the son of a shudra woman and a Brahmin, though the two were not married. She was probably a servant at the Brahmin’s house as Kavasa has been referred to as dasya-putra. Kavasa was never allowed to mingle with the Brahmins and was never allowed to enter places which were inhabited by the sages and the sort.