One of the coats of arms of the Counts of Celje. It was in use since Frederick II.
Image:Counts of Celje coat of arms (2-3).pngDescription: 

(in Slovene) [1] (Celjski zbornik, 1990. Vol. 26, No. 1. Pg. 55.)
(in Slovene) [2] (Tancik, Ferdinand. "Grbi v kapeli sv. Jurija na Ljubljanskem gradu." Kronika (Ljubljana). Vol. 18. No. 3 (1970). Pg. 166.)
SVG-conversion: User:Dbc334