Is C.S. Brother a writer?

There is no known author or individual called "C.S. Brother." It's possible this is a typo or a misunderstanding.

Perhaps you meant:

* C.S. Lewis: A renowned author, most famous for the "Chronicles of Narnia" series.

* C.S. Forester: A British author known for his historical novels, particularly those featuring naval officer Horatio Hornblower.

If you can provide more context, I might be able to help you further.