Visiting Rome in The Innocents Abroad, Mark Twain reflects on “the unsubstantial, unlasting character of fame.” He imagines how the people of 5868 A.D. will remember Ulysses S. Grant:

URIAH S. (or Z.) GRAUNT — popular poet of ancient times in the Aztec provinces of the United States of British America. Some authors say flourished about A.D. 742; but the learned Ah-ah Foo-foo states that he was a contemporary of Scharkspyre, the English poet, and flourished about A.D. 1328, some three centuries after the Trojan war instead of before it. He wrote ‘Rock me to Sleep, Mother.’

“These thoughts sadden me. I will to bed.”