The Wetterhorn summit was first reached on August 31, 1844, by the Grindelwald guides Hans Jaun and Melchior Bannholzer, three days after they had co-guided a large party organized by the geologist Édouard Desor to the first ascent of the Rosenhorn. The Mittelhorn was first summitted on 9 July 1845 by the same guides, this time accompanied by a third, Kaspar Abplanalp, and by British climber Stanhope Templeman Speer. The son of a Scottish physician, Speer lived in Interlaken, Switzerland.