It's from 1888-1949 Narnia was written 1950's. It is classic :)
4 siblings (2 brothers and 2 sisters) come from England into a magic land called Narnia. There they defeat a witch and are crowned kings and queens. But that is only one book out of seven. Great...
I think they might make 7!
The voice of Aslan was done by Irish actor Liam Neeson.
Mr. Tumnus is played by James McVoy. Is this what you meant to ask?