clerihew (n.)

humorous verse form, 1928, from English humorist Edmund Clerihew Bentley (1875-1956), who described it in a book published 1906 under the name E. Clerihew.

George the Third
Ought never to have occurred.
One can only wonder
At so grotesque a blunder. 

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Definitions of clerihew from WordNet

clerihew (n.)
a witty satiric verse containing two rhymed couplets and mentioning a famous person;
`The president is George W. Bush, Who is happy to sit on his tush, While sending his armies to fight, For anything he thinks is right' is a clerihew