Time-Traveling Historians in "Doomsday Book"

In Connie Willis's novel "Doomsday Book," "Time-Traveling Historians" are individuals who use advanced technology to travel back in time and study various historical periods. These historians use time travel to study historical events firsthand, but things go awry when they inadvertently end up in the middle of the Black Plague. In the story, the protagonist, Kivrin, is a time-traveling historian who is sent to the medieval era.