The Ih'valla was a rank in the D'jarra system on Bajor that was comprised of artists.

Before 2318, Darrah Karys, a member of the Ih'valla, married Darrah Mace, a member of the Ke'lora caste. This marriage was frowned upon by Karys's family and they caused difficulties until the couple had children. (ST - Terok Nor novel: Day of the Vipers)

Proka Etra's grandparents were members of the Ih'valla caste. (DS9 novel: The Never-Ending Sacrifice)

In 2372, Akorem Laan travelled forward in time and was considered to be the Emissary of the Prophets. He was from a time that had the D'jarra system and he called for the return of this system. Kira Nerys would have been an Ih'valla and she made various attempts to create art that ended badly and was about to leave the Militia to become an artist's apprentice, but Akorem was returned to the past and the D'jarra system was abandoned once again. (DS9 episode: "Accession")