Centuries before Kiruna was founded in 1900, the presence of iron ore at Kiirunavaara and Luossavaara had been known by the local Sami population. In 1696, Samuel Mört, a bookkeeper of the Kengis works, wrote on rumours about the presence of iron in the two hills. The ore became better known after it was reported by Mangi, a Sami man, in 1736 to Swedish authorities that had gathered in Jukkasjärvi Church. Soon after the reported finding Swedish senior enforcement officer and cartographer and mapper Anders Hackzell mapped the Kiruna area in 1736 and gave the mountains of the area their Swedish language names Fredriks berg (original Finnish name still in use as well: Kiirunavaara) and Berget Ulrika Eleonora (original Finnish name still in use as well: Luossavaara), after the King of Sweden Fredrik I and his wife Ulrika Eleonora.