Oswald of Northumbria was a 7th-century king who ruled over the Anglo-Saxon kingdom of Northumbria. He is best known for his efforts to spread Christianity in the region, particularly through his support of missionaries like Aidan of Lindisfarne. Oswald's reign is often marked by his military successes and his ability to unite various tribes under his leadership. Oswald became a saint after his death in 642 AD, following his defeat in battle against Cadwallon of Gwynedd. His legacy includes the establishment of monasteries and the promotion of the Christian faith, which significantly influenced the culture and religious landscape of England.