The ceremony ending centuries of war between Krios and Valt Minor, sealed by the gift of Kamala, an empathic metamorph raised from birth to become the perfect mate of the Valtese chancellor.
In The Next Generation episode The Perfect Mate, the Enterprise-D carries the Kriosian ambassador Briam and a guarded cargo to the peace ceremony. Two Ferengi, taken aboard after a staged emergency, tamper with the cargo and release it early: Kamala, a rare female metamorph who senses what any man desires and becomes it, until she bonds permanently with one.
The wars began when two brothers fought over a woman, and Kamala is meant to heal the breach. Crusher protests that she is being traded like property. When Briam is injured in a scuffle with the Ferengi, Picard must take over the ceremonial duties and spend time with her.
Kamala chooses to bond with Picard, taking on his sense of duty. Because of it she goes through with the marriage to Chancellor Alrik, who cares more for trade than for her, and will keep up the pretence for life.