Clerihew 

Edmund Clerihew Bentley
Worked swiftly if not gently,
Tracking murderers down by a hidden clew
In whodunit and clerihew.

Edmund Clerihew Bentley (who devised this form)

They give potted history on particular person, but they can also be about different subjects as well as in this example:

The subject of Biography
Is different from Geography,
Geography is about maps;
And Biography is about chaps.

Links on the web:

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