Which Shakespeare play is this?

[petmoosie]

Ariel is itching to become ruler of the merfolk. So she instigates a battle between King Triton and the bad sharks, while she sits on the sidelines with the good sharks. Finally, King Triton is eaten by a shark. Ariel then intervenes and cuts King Triton out of the stomach of the bad shark. King Triton retires and hands over the crown and trident to Ariel.

Switch all the names to Richard, and the sharks to soldiers and I am sure that Shakespeare wrote it.