The skies of Canidor are patrolled and defended by the Skymages, a military order of casters that ride hawkgriffins. When the first people started living in Canidor they found that stolen griffin eggs, while extremely tasty, served better if they were hatched and the baby griffins trained to be rode. Griffins are intelligent creatures and agreeable creatures, which are very protective of their adoptive families.
When the legions of Corrin came knocking, augurs and seekers would take to skies and rain fire and lightning from the above. Even then, the war did not go well for them, since Canidor hadn’t a proper army on the ground. Corrin slowly took the cities one by one. When Quintus’ wife Aedri finally signed the treaty, King Drewyn suggested she start an academy to train mages to fight from the back of griffins. Her hatred for Corrin aside, she knew good advice when she heard it. This is the fruition of her labor, her gift to Canidor, in remembrance of her lost husband.