The Legends of King Arthur: Tristan and Isolde

Sir Tristan leaves Camelot to defend Tintagel against an Irish invader. In doing so he receives a wound that can only be healed by going to Ireland himself. There he meets Isolde the Fair, doomed to become Tristan's true love. 'Doomed' because not all love stories have a happy ending. Especially when poison and potions are involved.