Prince of Time (The After Cilmeri Series Book Two) by Sarah Woodbury

Description

Prince of Time is Book Two in the After Cilmeri Series:  
Two teenagers are catapulted back in time to alter history and save the medieval kingdom of Wales …

David and his man-at-arms, Ieuan, find themselves alone and on the run from a company of English soldiers who've sworn vengeance for the recent death of their king.  Meanwhile, Llywelyn lays on his deathbed, wounded by a traitor's arrow.  And once again, it is David and Anna, and all that they represent, that holds the key to the survival of Wales.
Other books in the series are Footsteps in Time, the first book in the After Cilmeri Series, a companion novella, Winds of Time, Daughter of Time, a prequel, and Book Three, Crossroads in Time, available now.