A clerihew is a whimsical, four-line biographical poem that typically follows these characteristics:
Structure: It consists of four lines.
Rhyme Scheme: The rhyme scheme is AABB.
Content: It often humorously or wittily describes a person.
“Alexander the great
was chronically late.
But that’s the kind of leader you get
when watches aren’t invented yet.”
-Word Wool.com