The information in this article is from the fan game King's Quest II: Romancing the Stones and is therefore not canon.
Granthithor was the loyal First Knight to Legenimor that succeeded him as the second king of Daventry. He ruled Daventry for nearly 50 years, and his descendants went on to rule Daventry ensuring a continuation of the royal bloodline or create kingdoms of their own. The flagship of Daventry's fleet, the Granthithor, was named after the knight.