Crach an Craite, also known as Tirth ys Muire (Sea Boar) and the Wild Boar of the Sea, was a nephew of King Bran of Skellige and was mentored by Eist Tuirseach, king of Cintra. He was described as a broad shouldered youth with a mop of red hair and is known for sometimes showing quite a temper. He wasn known for his fiery temperament and healthy appetite.

In his early years he was a contender for the hand of Pavetta, Princess of Cintra, however, it never came to anything. After the death of his uncle Eist Tuirseach, who had inherited the throne of King Bran, Crach became the Jarl and thus, the ruler of the Skellige Islands.

He also had a brief affair with Yennefer and remained fond of her afterwards, which he demonstrated by helping her in her search for Vilgefortz.