The Holy Rings of Betazed were a collection of important rings from Betazoid history.
Legend said that the rings were given to Rixx, a follower of the hero Khrysaros in the year 9 B.C. by Khrysaros. The rings were also said to be able to summon the hero "during Betazed's time of greatest need." (Last Unicorn RPG modules: Planets of the UFP, All Our Yesterdays: The Time Travel Sourcebook)
By the mid 24th century the rings were in the possession of the Fifth House of Betazed, specifically Lwaxana Troi. Lwaxana would often remind others that she was the "Heir to the Holy Rings of Betazed," as well as a daughter of the Fifth House, and the holder of the Sacred Chalice of Rixx. (TNG episodes: "Haven", "Half a Life", DS9 episode: "The Forsaken")
Lwaxana once admitted to Q that no one, not even she, really cared about the Holy Rings, and that she kept them in a box in the back of a closet in her home. She only focused on them to avoid dwelling on the very real possibility that her daughter Deanna Troi would predecease her. (TNG novel: Q-in-Law)