Violante de Castilla y Aragón

Violant of Castile (Spanish: Violante de Castilla y Aragón; 1265–1287/1308), infanta of Castile and Lady of Biscay on her marriage to Diego López V de Haro. She was the daughter of Alfonso X of Castile, and Violant of Aragon.

She was the daughter of Alfonso X of Castile, and Violant of Aragon. On her father's side, she was the granddaughter of Ferdinand III of Castile, and his first wife, Elisabeth of Swabia. On her mother's side, she was the granddaughter of James I of Aragon, and his second wife, Violant of Hungary.

Infanta Violant of Castile was born in 1265. In 1272 it was agreed, and a year later confirmed that she would marry King Henry I of Navarre's son and heir apparent, Theobald, which would establish an alliance between Castile and Navarre. The marriage proposal failed with the death of the young Theobald after he fell from a battlement at the castle of Estella in 1273. Later, in 1282, she married Diego López V de Haro, Lord of Biscay.

Her date of death is unknown, but must have occurred sometime between 12 March 1287 and 30 January 1308. After her death, she was buried at the now destroyed Monasterio de San Francisco de Burgos. In the same monastery was buried later her husband.

In her marriage to Diego López V de Haro, Lord of Biscay, they had four children:

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