Lucenya Velaryon was known by many names throughout Westeros; The Pearl of The Realm, The Protector of The Step-Stones, The People's Queen, The Lady of The Tides, and many more.
Her death caused the Dance of The Dragon's and it caused the people to start rioting. Her death was the start of the end of house Targaryen.
Or in which the Blacks, and the Greens watch the life of Melody daughter of King Eric and Queen Ariel. The reincarnation of Lucenya Velaryon.