Tomo Česen, a renowned Slovenian mountaineer, was born on 5 November 1959 in Kranj. He was known in the 1980s and 1990s for a number of significant solo ascents of peaks in the Himalayas and the Karakoram. His ascent of K2 via the south face remains one of his greatest achievements. However, some of his ascents were called into question due to a lack of evidence (Lhotse and Jannu).