In King's Quest III: To Heir is Human (1986) by Roberta Williams, you play 17-year-old Gwydion, who must escape enslavement by the evil wizard Mannanan, who kills all his slaves when they turn 18.
In King's Quest II: Romancing the Throne (1985) by Roberta Williams, lonely King Graham sees a maiden trapped in a tower and goes on a quest to find and marry her.
In King's Quest IV: The Perils of Rosella (1999) by Roberta Williams, King Graham is dying, so Princess Rosella uses Merlin's Mirror to go the land of Tamir in search of a fruit which cures all ills.
In King's Quest (1984) (later retitled King's Quest I: The Quest for the Crown) by Roberta Williams, Sir Graham goes on a quest to retrieve the three lost treasures of the fairy tale realm of Daventry.
In King's Quest VII: The Princeless Bride (1994) by Roberta Williams, Princess Rosella and her mother are talking about marriage when they see a castle in a pond and jump in.
In King's Quest VI: Heir Today, Gone Tomorrow (1993) by Roberta Williams, Prince Alexander goes on a quest to find Cassima (who he met briefly in King's Quest V) and make her his bride.
In King's Quest V: Absence Makes the Heart Go Yonder (1990) by Roberta Williams, King Graham's castle and entire family disappear, and he must go on a quest to find them.
In Mask of Eternity (1998), all the people of Daventry but a villager named Connor are turned to stone after a golden shard lands at his feet. A 3D adventure game with some combat elements.