Prince Rhaegar loved his Lady Lyanna and thousands died for it. Daemon Blackfyre loved the first Daenerys, and rose in rebellion when denied her. Bittersteel and Bloodraven both loved Shiera Seastar and the Seven Kingdoms bled. The Prince of Dragonflies loved Jenny of Oldstones so much he cast aside a crown, and Westeros paid the bride price in corpses.