In Ezekiel 28, the ruler of which city proudly said, "I am a god"?

Answer: Tyre

The ruler of Tyre said, "I am a god; I sit in the seat of gods in the heart of the sea," yet God said, "you are a man and not a god."

““Son of man, tell the ruler of Tyre that this is what the Lord GOD says: Your heart is proud, and you have said, ‘I am a god; I sit in the seat of gods in the heart of the sea.’ Yet you are a man and not a god, though you have regarded your heart as that of a god.”— Ezekiel 28:2 (BSB)