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Carolin Hastur, or "Dom Carlo of Carcosa", is the rightful heir to the Hastur throne when his grandfather dies and his cousin Rakhal Hastur of Elhalyn and his councillor Lyondri Hastur take over and make him an exile and fugitive.  While on the run and fighting to regain his throne he uses the name Dom Carlo.

Carolin met Varzil Ridenow while at Arilinn Tower and the two soon became friends. Because of their bruises caused by laran weapons and the losses of war they form an idea that will later become the Compact, which helps end laran warfare on Darkover. Carolin was fostered with Maura, Jandria, Orain Castamir, Rakhal and Lyondri Hastur at Castle Hastur and was close friends with Eduin MacEarn.

As a youth, Carolin studied at Arilinn Tower and was raised by his grandfather to rule. He was betrothed to Alianora Ysabet Ardais, an arranged marriage which bore two sons. After regaining the throne, Carolin marries Maura Elhalyn.

Carolin is described as having brilliant red hair, grey eyes, a modest amount of laran, but posesses some prescience.  He is the heir of Hastur due to his being the son of the king's eldest brother.