Thria is a territory of Lycia, located south-east of Ostia, the capital. During the time of Fire Emblem: Binding Blade, Thria was ruled by Marquess Orun, Hector's cousin, known for his peaceful nature. Roy intended to pay Thria a visit to rest his troops, but little did he know Thria was already under the enemy's grasp and Orun was dead. Wagner poses as Orun's advisor and lets Roy's army seek refuge, aiming to ambush them and offer Princess Guinivere to Bern. Cath overhears this plot and warns Roy, who hastily attempts to leave Thria. He is stopped by Wagner and eventually a battle ensues.