The Church of Seiros is a prominent religious institution in the world of Fire Emblem: Three Houses. It is dedicated to the worship of Seiros, a goddess who is believed to guide and protect the people of Fódlan. The church plays a significant role in the political and social landscape of the region, influencing various factions and leaders. The church is known for its teachings on morality, justice, and the importance of faith. It operates several monasteries, including the famous Garreg Mach Monastery, which serves as a center for education and training for future leaders and warriors. The church also oversees the Knights of Seiros, a military order dedicated to upholding its values.