An
Ambassador-class heavy cruiser, the
Horatio was commanded by
Captain Walker Keel.
Keel, an old friend of Captain Picard, arranged a secret meeting of four captains on Dytallix B. Keel gathered the captains together to discuss the existence of a possible conspiracy within the Federation.
Following that meeting, the Horatio imploded as it broke orbit, thus cementing Picard's belief in Keel's suspicions.