Triglav (Monte Tricorno) is the highest mountain in Slovenia (and, formerly, in all of Yugoslavia and the Illyrian Provinces) and the Julian Alps. While its name, meaning "three-headed", can describe its shape as seen from the valley of Bohinj, the mountain may have been named after the Slavic god Triglav, although this hypothesis remains disputed, as the deity is not well understood and it is not documented whether it was ever worshipped in the area.
The mountain is the preeminent Slovene national symbol. A stylized depiction of its distinctive shape is the central element of the Slovenian coat of arms, and is in turn featured on the flag of Slovenia (and, formerly, on the arms of the Socialist Republic of Slovenia). A photorealistic relief of the mountain is the design on the national side of the Slovenian 50 eurocent coin.
The first recorded ascent of Triglav was made on 26 August 1778, by Luka Korošec, Matija Kos, Štefan Rožič and Lovrenc Willomitzer, on the initiative of baron Sigismund Zois. Its height was first measured in 1808 by Valentin Stanič.
At the top of the mountain stands a small metal structure, the Aljaž Tower (Aljažev stolp), symbolic of Slovene territorial sovereignty and a national symbol itself. The tower's namesake was the priest, mountaineer and patriot Jakob Aljaž, who around 1900 purchased the Kredarica waypoint and the summit for the sum of five Austro-Hungarian florins.
Since 1961, the mountain has been the centerpiece of Triglav National Park, Slovenia's only national park.
A Slovene flag was unfurled from the summit of Triglav on 26 June 1991, the night of the declaration of independence of Slovenia from Yugoslavia.