Battle of the Trident

From Asoiaf

At the Battle of the Trident Prince Rhaegar, King Aerys II's heir, was slain by Robert Baratheon

Robert Baratheon, Lord of Storm's End fought Prince Rhaegar Targaryen at the ford. In the end Robert's warhammer smashed the chest of Prince Rhaegar. When Eddard Stark, Lord of Winterfell came to the scene men from both sides were scrabbling for rubies knocked of Rhaegar's armor.