A Connecticut Yankee in King Arthurs Court by Mark Twain Chapter 40 Page 19

And when a man was running, and threw himself on his stomach to slide to his base, it was like an iron-clad coming into port. At first I appointed men of no rank to act as umpires, but I had to discontinue that. These people were no easier to please than other nines. The umpire’s first decision was usually his last; they broke him in two with a bat, and his friends toted him home on a shutter. When it was noticed that no umpire ever survived a game, umpiring got to be unpopular. So I was obliged to appoint somebody whose rank and lofty position under the government would protect him.

Here are the names of the nines:

BESSEMERS ULSTERS

KING ARTHUR. EMPEROR LUCIUS.

KING LOT OF LOTHIAN. KING LOGRIS.