David

David and his family are the lighthousekeepers of Greyhaven, located south of Trinsic, in Ultima V.

After getting a hint from the bard Scally in Buccaneer's Den, the Avatar visited Greyhaven to ask David about his invention, the sextant. David was willing to give it the Avatar, after getting some praise for the invention, feeling that the hero had more use for it.

David otherwise proved quiet, and was somewhat annoyed with his wife Charlotte's positive outlook on the regime imposed by Blackthorn.

Ultima V: Lazarus
In Ultima V: Lazarus, David provided little useful information to the Avatar at first, insulting the hero for asking even the most basic questions. It was only after the hero learned about the sextant from the bard Scally in Buccaneer's Den that the crotchety old man opened up to the hero, lovingly telling the Avatar all about his invention. He would eventually give it to the hero, saying he had little use for it now that he was land bound.

The Ultima 6 Project
In The Ultima 6 Project, it is revealed that David left his wife Charlotte when she became increasingly fanatical about the Oppression, and took his son Aleyn along to protect him.

Trivia

 * The sextant was already available in Ultima IV.