“Dorne,” the woman whispers softly, “does not take orders from this boy king.”

Tyrion knew, as he gazed up at the dark skinned Martell man that this was perhaps his only chance to spirit Sansa out of King's Landing and away from his father's greedy fingers. Tywin Lannister would have married the girl himself if he felt he could have gotten away with it, and so Tyrion knew his own marriage was no protection to Ned Stark's daughter whatsoever. "Invite her, demand her, steal her--whatever you choose, Prince Oberyn, choose it soon. Else my lady wife shall break into more pieces than the stars."

Oberyn Martell knows how to handle a spear, say the whisperers; he is a vicious fighter and his blade is always poisoned. It’s hardly surprising, then, that poisoned, too, is his invitation. (Missing scene set during A Storm of Swords)