Gwendal is a knight in service to House Rowe of the Holy Kingdom of Faerghus. Roughly four years prior to the start of the game, Sylvain tried to involve himself with Gwendal's daughter; he had to be placated by Ingrid. In the game proper, he follows House Rowe throughout the war between the Adrestian Empire and the rest of Fódlan. On the Crimson Flower route, House Rowe remains loyal to the Kingdom, and he is one of the commanders in defense of Fort Arianrhod alongside Cornelia, Rodrigue, and non-recruited Felix and Ingrid. On all other routes, House Rowe betrays the Kingdom for the Empire, and he pursues Byleth and their allies to the Valley of Torment to prevent them from receiving reinforcements. In both cases, he fights Byleth and their forces, but is killed in battle.