What does Ezekiel 28:12 mean?

'Son of man, sing a funeral song for the king of Tyre. Say to him: This is what the Lord God says: You were the perfect example, full of wisdom and flawless in beauty.' Ezekiel 28:12 - Modern Text Bible

(The king of Tyre is described as once being the ideal of wisdom and beauty, setting up the tragedy of his fall.)