Children’s book about a terrible king and queen

I read it in about 1996/97. It was for young children so it had mostly illustration with a relatively small amount of text. The king had black hair and a beard I think. The queen had wild, unkempt hair

I think it was either in rhyme, or had rhythmic sentences.

The only part of it I remember was describing the king and queen: “….he was cruel, and she was crazy!”