This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Matthias Corvinus' Black Legion. Flag of king Matthias Corvinus' Black Army to The reconstruction is based on miniature in the Philostratus Chronicle one of the Corvinas depicting Jnos Corvinus entering Vienna in The black lions and stripes were originally white argent but the paint of the miniature became oxidised and the reconstruction