The Captain of Nero

A ship named Nero sailed the dark sea
When a storm started to brew
Out the waves came a banshee
And it caused panic in the crew

One brave man by the name of Jack
Picked up a sword lying on the deck
He swung the weapon to attack
Aiming for the monster's neck

The sharp blade made a deadly cut
Across the banshee's throat
It wedged itself inside her gut
And Jack began to gloat

In the eyes of many, Jack became a hero
From that day on he was the captain of Nero



This is an English sonnet about a man named Jack who fought a monster. 
There is no particular rhythm but it has a rhyme scheme of abab cdcd efef gg and 4 stanzas. 
Assonance is used in line 9, "The sharp blade made a deadly cut" with the vowel 'a'.