Black Knights' Fortress

Oops! Unfortunately, in Jagex's North Korean-esque attempt to rewrite the past, this quest no longer exists. Presumably you're looking for The Death of Chivalry? If you're sad that you will never get to play this quest, don't be. It was horrifically over-rated and it made way too much use of cabbage as a plot point. You shouldn't care about this quest at all.