Pendragon Cycle #1
A Christian look at the Arthurian legend. This starts long before Arthur though. It starts with the destruction of Atlantis. It continues with an unknown Prince, who was prophesied to be the Summer King, marrying an Atlantean Princess[refugees settling in Briton] and ends with the birth of their son Merlin who Taliesin gives his life in exchange for. Taliesin gave up being the Summer King so that his son could live, and usher in the True Summer King.
I haven’t read this series in over 6 years and I still cried when Taliesin died. Powerful stuff.