The Chronicles of Thomas Covenant, the Unbeliever (series of novels)

These days I'm reading The Chronicles of Thomas Covenant, the Unbeliever, by Stephen R. Donaldson.

More about the Chronicles in this Wikipedia article or on the author's page.
Valentin Poposki, 10 February 2007

In the first story about the "Land", a flag is described in the first book "Lord Foul's Bane", when the main charachter Thomas Covenant entered the capital of the Land - Revelstone:

[...]Blue flag, a bit lighter than the sky [...]

Valentin Poposki, 10 February 2007

I received these books in one volume at Christmas. I don't remember this flag or any flag being mentioned flying anywhere other than from the tower at Revelstone. I understand it quite as the flag of the Council of Lords that rule the Land.

It is usually described as an (azure) oriflamme and named "High Lord's Furl". When Covenant first sees it, there is a red pennant beneath it. He is asked,

Do you know the colours? The blue is High Lord's Furl, the standard of the Lords. It signifies their Oath and guidance to the peoples of the Land. And the red is the sign of our present peril. It will fly their while the danger lasts."

When he leaves Revelstone, a white pennant has been added representing himself, the "white gold wielder".
Jonathan Dixon, 12 February 2007

The war flag is hoisted as the army is about to ride out to meet the enemey.

It was a huge oriflamme, twice as tall as the Lords who raised it, and it was clear blue, the colour of High Lord's Furl, with one stark black streak across it.

It is not clear when the Furl is hoisted. In the third book, /The Power That Preserves/, the High Lord goes to the tower to respond to the challenge of the besieging enemy, and raises the Furl defiantly before speaking.
Jonathan Dixon, 12 February 2007