Ljubljanica as a river disappears several times in the rocks of the Karst region and than reemerges as a river with a different name. Number of names that Ljubljanica has before it becomes Ljubljanica: 6
Trbuhovica, Obrh, Stržen, Rak, Pivka, Unica » Ljubljanica
Number of Argonauts helping Jason to kill the dragon (which now continues to live in the coat of arms of Ljubljana, the flag and the Dragon bridge): 49 + Jason
Number of heads of bishops on the main door of the Saint Nicholas Cathedral in Ljubljana: 6