The Mystic Knights of Tir Na Nog (1998)

Four young knights, Rohan, Deirdre, Angus and Ivar, defend their ancient homeland of Kells from attacks by the evil Queen Maeve who is intent on ruling the island kingdom. The knights bravely resist Maeve's dark sorcery, battling giants, ogres and evil mythical creatures. Their quest to restore peace to the land leads the knights to discover their mystic armor and their dragon ally, Pyre, who joins them on adventures filled with danger, magic, and the roguish little people who inhabit the enchanted underworld of Tir Na Nog.