There are 3 books in the The Northumbrian Thrones series. The newest book is Oswiu which came out in 2016.

1
Edwin

Book cover of Edwin
Edwin, the deposed king of Northumbria, seeks refuge at the court of King Raedwald of East Anglia. But Raedwald is urged to kill his guest by Aethelfrith, Edwin's usurper. As Edwin walks by the shore, alone and at bay, he is confronted by a mysterious figure - the missionary Paulinus…
When you buy books, we may earn a commission that helps keep our lights on (or join the rebellion as a member).

2
Oswald

Book cover of Oswald
The exiled family of King AEthelfrith of Northumbria arrive, after much hardship, on the island of Iona, where the monastery founded by St Columba has become a centre of worship and learning. Young Oswald becomes firm friends with a novice, Aidan. When Aidan professes his final vows, Oswald and his…

3
Oswiu

Book cover of Oswiu
Oswald's head is on a spike. Can Oswiu avoid the same fate? The great pagan king Penda set a trap, and when the brothers Oswiu and Oswald walked in, only one came back alive. Rumours abound that the place where Oswald's body is strung up has become sacred ground -…