Don't you know?

'Who is Aslan?' asked Susan.

'Aslan?' said Mr Beaver. 'Why, don't you know? He's the King, He's the Lord of the whole wood, but not often here, you understand. Never in my time or my father's time. But the word has reached us that he has come back. He is in Narnia at this moment. He'll settle the White Queen all right. It is he, not you, that will save Tumnus.'

(Chapter Eight, p74)