In the King's Service is a historical fantasy novel by American-born author Katherine Kurtz. It was first published by Ace Books in 2003. It was the fourteenth of Kurtz' Deryni novels to be published, and the first book in the fifth Deryni trilogy, the Childe Morgan trilogy. The events of this trilogy are a direct prequel to the first Deryni trilogy, the Chronicles of the Deryni.

The Bastard Prince is a fantasy novel by American-born author Katherine Kurtz. It was first published by Del Rey Books in 1994. It was the twelfth of Kurtz' Deryni novels to be published, and the third book in her fourth Deryni trilogy, The Heirs of Saint Camber. Although the Heirs trilogy was the fourth Deryni series to be published, it is a direct sequel to the second trilogy, The Legends of Camber of Culdi. The next Deryni novel to be published, King Kelson's Bride, was a direct sequel to the Histories of King Kelson trilogy, but the internal literary chronology of the series was later continued in In the King's Service, the first book of the Childe Morgan trilogy.