Tomo Česen

Tomislav "Tomo" Česen (born November 5, 1959) is a Slovenian mountaineer; he specialises in solo ascents in the Alps and the Himalayas.

At the age of 26, he reported that he had enchained the three Great north faces of the Alps, becoming the first person to do so solo in winter.

He has claimed a number of other notable mountaineering achievements, but some of his claimed ascents have often met with skepticism from others in the mountaineering community. The most controversial was his 1990 solo ascent of Lhotse, the 4th highest mountain in the world.

One of the more popular routes on K2 is named after him (the Cesen Route) after he soloed it in 1986.

...
Wikipedia