Dorne is the southernmost and least populated land of Westeros. The capital, Sunspear, is the seat of the ruling House Martell. As of the first five books, Doran Nymeros Martell is the Prince of Dorne and Lord of Sunspear. Doran's sister, Princess Elia, was married in a political alliance to Prince Rhaegar Targaryen, the Prince of Dragonstone and heir to the Iron Throne. They had two children, a daughter, Rhaenys, and a son, Aegon. During the Sack of King's Landing at the end of Robert's Rebellion, Princess Elia was raped and murdered by Gregor Clegane, a House Lannister bannerman (vassal). Her children were also killed in front of her. Prince Doran and his wife, Princess Mellaria, have three children, Arianne, Quentyn and Trystane. During the War of the Five Kings, Tyrion Lannister, as Hand of the King, turns the historical enmity of House Martell and Dorne into an alliance by sending King Joffrey's middle sibling and sister, Myrcella Baratheon, as the betrothed future bride to Trystane, the youngest child of Prince Doran, who is about her own age. The eldest child of Prince Doran, Arianne, is heir to House Martell, Sunspear and the rule of Dorne. The wealth of Dorne comes from their famous Sand Steeds, purebred horses of endurance, speed, and grace, and from spices, wines, fishing, fabrics, and textiles.