Indiana Jones a famous archaeologist who may have once discovered the Desert Temple in the early 20th century. Rumors about he was searching for the Holy Grail but was unsuccessful at recovering it.
It is unknown if he is one of the archaeologists that help discover Castle Daventry in more 'modern' times towards the end of the 20th century.
Well, ya, King's Quest is on Earth. Daventry is very old city from a long time ago. It's in ruins now and people aren't quite sure exactly where it used to be. There are some archaeologists searching through the ruins, they think they know it's Daventry. But it's somewhere on Earth."-Roberta Williams, Talkspot Interview, part 1 (1:20:40 to 1:59:58)[1]