The standard form of a limerick is a stanza of
five lines, with the
first, second and fifth rhyming with one another and having three feet of three syllables each; and the
shorter third and fourth lines also rhyming with each other, but having only two feet of three syllables.
The first line traditionally introduces a person and a place, with the place appearing at the end of the first line and establishing the rhyme scheme for the second and fifth lines.