Jacaerys Targaryen of Whitefyre "The Cruel"

Jaecaerys was the son of Maelor I Targaryen of Whitefyre, "the Usurper" and just like his father he considered himself the rightful heir. At the death of his father, Vaegon I Targaryen of Whitefyre, his cousin and rightful heir to the Throne of the Three Islands before Maelor took it from the infant, was crowned. Jaecaerys then rose in arms to usurp the position from Vaegon as son of Maelor. In reality the coronation was done as soon as Maelor I died, quickly to avoid having to face Jaecaerys.

Jaecaerys was very similar to Maegor Targaryen, the third Targaryen King. He was noticed to hurt animals since a very young age and to enjoy cruelty to others. He tortured his enemies and displayed their corpses once executed in gruesome manners.

He was married to Alaera Targaryen of Whitefyre, his sister, who was a free spirit. It is said that she was forced into the marriage by his father and against her will, giving birth to Jaecaerys only surviving daughter, Viela Targaryen of Whitefyre. Alaera however runaway from her husband and rven fought against him in the wars.