Tuck by Stephen R. Lawhead

Tuck

Aided by Friar Tuck and his small but determined band of forest-dwelling outlaws, Rhi Bran ignites a rebellion that spreads through the Welsh valleys, forcing the wily monarch to marshal his army.
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To save their kingdom of doppelgängers, both orphaned Waruu and King Daccias must face their greatest enemy—each other. 

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Sons of Day and Night by Mariposa Aristeo