Legend by David Gemmell (The Drenai Saga #1)

His name is Druss

The stories of his life are told everywhere. But the grizzled Drenai veteran has spurned a life of fame and fortune and retreated to the solitude of his mountain lair.

The fortress is Dros Delnoch

And it is the only route through the mountains for the invading army of the Nadir. The fortress was once the Drenai's greatest stronghold - now it will be their final battleground. And Druss their last hope.

Book by author David Gemmell.