“imperial / emperor” in Japanese is 皇, read kou, ou (こう, おう). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 天皇 (the Emperor).
What does 皇 mean?
天皇が国民に話した。
Same sound, different character — the classic trap. Compare them side by side: