Elia Sand

Elia Sand is an unseen character in the fourth season. She is first mentioned in "First of His Name".

Background
Elia Sand is the fifth of the eight bastard daughters of Prince Oberyn Martell, and the oldest of the four born to Oberyn's paramour Ellaria Sand. She was named after her aunt, the late Princess Elia Martell.

Season 4
Oberyn writes a poem to Elia and mentions her willful behavior to Queen Cersei.

In the books
In the A Song of Ice and Fire novels, Elia Sand is described as wearing her black hair in a braid and having her father's eyes. She's fond of horses and jousting, for which she often smells like a horse to her mother's despair. Her weapon of choice is the lance, for which she's dubbed "Lady Lance". Her mother affectionately refers to her as "El".