The information in this article is from the fan game King's Quest II: Romancing the Stones and is therefore not canon.
The Granthithor is the flagship of Daventry's fleet. It was named after the second king of Daventry, Granthithor.
Background[]
Graham travelled a day's journey from Daventry to the pier by the shores of Kolyma on the Granthithor. He was safely transported and deposited on the pier by his crew. He watched it depart with pride, and felt a sense of anxiety building within him. Once it was gone, he was quite alone in the country. They planned to return the day after the following day, after he had located and released the imprisoned Valanice he had seen in the Magic Mirror.
Behind the scenes[]
It resembles the ship in KQ6 (which was the flaghship of Daventry), suggesting it was intended to be the same ship.