Asen dynasty royal insignia was the snow leopard wich is unique for europe and they were all over two meters high 6 feet 7 inches wich is giant for the age when men were 170 sm the most....brothers asen and peter had third brother kaloyan the beautiful or kaloyan the roman slayer,wich is answer of byzantene emperor basil the second called himself the bulgarslayer the one that conquered the first bulg empire in 1018a.d.
Interesting. Yes I know about Kaloyan and Basil I the Bulgar slayer. The difference is that Basil earned his title years after his death when more stories of what he did to Bulgarians started emerging. Unlike Kaloyan, who was priding himself during his lifetime for killing byzantines, Greeks and Bulgarians alike.