Russian proverb – Even the Emperor won’t see his face.
Хвали́лся чёрт всем ми́ром владе́ть, а Бог ему́ и над свиньёй не дал вла́сти. Literal: The devil boasted to rule the whole world, but God didn’t give him power even over the pig. – English Equivalent: Deprive a mirror of its silver and even the Emperor won’t see his face.