On October 12, 1890, he accompanied as interpreter and vice-consul a Swedish legation to Persia which was to present the Shah of Persia with the insignia of the Order of the Seraphim. As part of the Swedish legation, he was at an audience of the shah Naser al-Din Shah Qajar in Teheran. He spoke with him and later accompanied him to the Elburz Mountain Range. On July 11, 1891, he and three others climbed Mount Damavand where he collected primary material for his dissertation. Starting in September he traveled on the Silk Road via cities Mashhad, Ashgabat, Bukhara, Samarkand, Tashkent and Kashgar to the western outskirts of the Taklamakan Desert. On the trip home, he visited the grave of the Russian Asian scholar, Nikolai Przhevalsky in Karakol on the shore of Lake Issyk Kul. On March 29, 1891, he was back in Stockholm. He published the books King Oscar’s Legation to the Shah of Persia in 1890 and Through Chorasan and Turkestan about this journey.

Source: Wikipedia.