…of rewarding merit, great abilities, eminent services; of instructing princes to know their true interest, by placing it on the same foundation with that of their people; of choosing for employments persons qualified to exercise them, with many other wild, impossible chimeras, that never entered before into the heart of man to conceive; and confirmed in me the old observation, "that there is nothing so extravagant and irrational, which some philosophers have not maintained for truth."
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She describes his dream as a political chimera.
Flaming serpents, chimaeras, and dragons rose and fell and rose again
J.K. Rowling -- Harry Potter and the Deathly Hallows