ND Ilirija , 1920. The colours were red and white.
A Slovenian football website has this group labelled as Hermes (1910), so it looks as if ND Ilirija took on the club colours after their merger.
1913 was a significant year in the development of Slovenian football. Hermes and ND Ilirija had been coverging slowly- Hermes providing Ilirija with a venue, practice facilities, balls and even, increasingly, players. in 1913 the clubs merged.
ND Slovan (1913)1913 also saw the foundation of ND Slovan as the city's second major team.
August 5, 1913. ND Ilirija 0, Slavia Prague 10
The Balkans were at the centre of the 1914-18 war, so it is hardly surprising that there wqas not much football activity during these years. From 1919 Slovenia was pat of The Kingdom of Serbs, Croats and Slovenes.
Football prospered after the war, with clubs emerging throughout Slovenia. In 1920 a regional football association,
Ljubljanska nogometna podzveza, was formed. This was a branch of the national governing body. A Slovenian representative side was also formed, losing 5-0 to France.
On the national scene two Slovenian players represented Yugoslavia.
full-back Stanko Tavčar (ND Ilirija ) appeared at the 1920 Olympics. Goalkeeper Maksimilijan (Maks) Mihelčič, who began his career with Hermes but for most of his career played for HSK Gradanski Zagreb, represented Yugoslavia 18 times, including at the 1928 Olympics.
Slovenian clubs made little impact on the Yugoslavian national championships. ND Ilirija competed in the years 1923-1927. In the first 4 editions, which were cup competitions, they didn't make it past the 1st round, and in 1927, when a league system was introduced, they finished bottom of the 6 team table.
On the domestic front ND Ilirija were dominant. The regional championship was introduced in 1920.
The list of champions reads:
1920: ND Ilirija
1920/21: ND Ilirija
1921/22: ND Ilirija
1922/23: ND Ilirija
1923/24: ND Ilirija
1924/25: ND Ilirija
1925/26: ND Ilirija
1926/27: ND Ilirija
1927/28: ASK Primorje
1928/29: ASK Primorje
1929/30: ND Ilirija
1930/31: I.SSK Maribor
1931/32: ND Ilirija
1932/33: I.SSK Maribor
1933/34: ND Ilirija
1934/35: ND Ilirija
1935/36: SK Ljubljana
1936/37: SK Železničar Maribor
ASK Primorje- founded in 1920, a Ljubljana based club that merged with ND Ilirija in 1935 to become SK Ljubljana.
1 SSK Maribor- First Slovenian Sports Klub Maribor- a multisport club based in Slovenia's second largest cirty, founded in 1919.
NK Železničar Maribor another Maribor club, formed by the railway workers.