In 2298, the Federation and Myhr'an disputed each other's right to the planet, and the Battle of Canaileus Prime ensued. The Federation won, starting a 70-odd year period of non-contact between the two powers. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")
Starfleet ordered all available starships to rendezvous at Canaileus Prime to regroup to face the Myhr'an threat as it was believed this planet was the next target of the Myhr'an planet killer. This sparked the Second Battle of Canaileus Prime. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part Two")
- Canaileus is pronounced "cah-NAIL-ee-us".