When did Joe Simpson and Simon Yates first climb together?

Joe Simpson and Simon Yates first climbed together in 1985 during their expedition to the Siula Grande in the Peruvian Andes. Their partnership gained notoriety due to their harrowing experience on the mountain, which was later recounted in Simpson's book, "Touching the Void." This climb marked the beginning of their significant climbing relationship and showcased their contrasting styles and approaches to mountaineering.