Harding, Traci. Celestial triad series #bk. 1

Earth must follow its own path for a time, while the gods battle elsewhere. Noah, storyteller and chronicler, tutors the children born after colonization and must explore the past to fill in the gaps in his written histories. Tory, Maelgwn, and Rhun recall their life and times in ancient Britain when Maelgwn reigned as High King of the Britons and tory was a student of time travel and immortality under Taliesin. Rhun became King of Gwynned after Maelgwn. When Vortipor, High King of the Britons, dies, there is a bloody four-day skirmish over who should succeed him. Sir Bryce is killed in the action, and Rhun is forced to abdicate. Noah finds himself on a celestial journey through the ethers, space and time as the missing years in his Chronicle of Ages unfold

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