More on Cat may look at a King from Infoplease:

• Cat may look at a King - Cat may look at a King (A). An insolent remark of insubordination, meaning, “I am as good as ...
• The Queen's Croquet-Ground - of Alice's Adventures in Wonderland, by Lewis Carrollby Lewis Carroll A Mad Tea-Party The Mock ...
• Dictionary of Phrase and Fable: C - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "C"