In the first half of the 19th century, it was believed that the Schwarzenstein was the highest mountain in the Zillertal Alps. But when, in 1858, the Austrian alpine researcher and geographer, Anton von Ruthner, stood on the summit of this mountain, he realized that the Möseler, which he called the Schneeberg, to the west had to be significantly higher. On 12 August 1863, von Ruthner attempted an ascent of the Möseler with two guides from Breitlahner in the Zemmgrund, but in thick fog only reached the Nöfes Saddle, which they initially thought was the Möseler. When, later, the fog lifted, they realized their error. However, they were not the first to have used this well-trodden, ancient crossing. Not until the tour by Englishman, Francis Fox Tuckett on 16 June 1865, with his Swiss mountain guides and local bearers, did someone successfully conquer the mountain. That tour began in South Tyrol's Lappach in the Lappach valley (now part of the municipality of Muehlwald) at four clock in the morning and headed north to the East Nevesferner. After crossing the glacier, they reached the South Arête of the Möseler in fog, but only got as far as the southern subpeak, the significantly lower Möselekopf. As the fog lifted, they realized that they had not climbed the main peak; instead the highest point appeared to the northeast as a broad rocky summit. Finally, crossing the icy South Arête they reached the Great Möseler after two and a half more hours at 12.30 pm. As the weather cleared, Tuckett now realized that even the tediously conquered Großer Möseler was not the highest mountain in the Zillertal Alps. To the west, an icy summit towered even higher above them. An angle measurement brought unwelcome confirmation: this ice pinnacle, later called the Hochfeiler, had to be the long-sought after, highest point of the mountain range. The mountaineers descended northwards to Schlegeistal valley and at around 9 pm they finally reached the Alpine hut at Breitlahner.