Once On a Time by A.A. Milne

Amazon | Project Gutenberg
"My suggestion, your Majesty," said the Chancellor, "is that for the present there should be merely an exchange of Stiff Notes; and that meanwhile we scour the kingdom for an enchanter who shall take some pleasant revenge for us upon his Majesty of Euralia."
A hilariously delightful satire of the classic fairytale that both children and adults will love, filled with side-splitting adventures—a king whose experimenting with seven-league boots starts a war, a princess whose suitor falls victim to a very awkward spell, and a scheming Countess who fancies herself able to write poetry.