Gannon

was a Holy Knight who conspired to kill Matrona and Diane to obtain higher ranks but ended up dying by the former's hand despite managing to kill her by poisoned bolt.

Personality
Gannon is an ambitious and manipulative person that he hid under his polite and courteous facade as he believed that killing Giants will give him more merits than taking out savage tribes and may lose composure when things didn't go according to plan but this led to his deserving death for underestimating a Giant.

History
Hiring the famous Earth's Great Fang and Diane, Gannon and his force of 330 Holy Knights and soldiers with giant ballistae engines met them in the open field where he greeted them courteously and brushed off the future Serpent's Sin of Envy about Meliodas.

Abilities/Equipment
As a Holy Knight of Liones, it is presumed that Gannon is very powerful in his own right.

Abilities

 * Hollow Sound: A power that allows Gannon to manipulate the sounds to confuse and distract his opponents and enthrall people to his will.

Weapons
Gannon wields a sword he carries around.