Νice picture.
Byzantines were few centuries forward to this.
We read in Tactica of Leon VI the wise .
"When you construct you axes (tzikouria) make sure that the have two parts.
One as a blade and one as as spearhead to penetrate the armors".
Byzantines had two versions of it.
1:

2:

Does the 2nd axe reminds you a haldberg?
Yes it started as a long axe that infact was adopted in huge numbers by Italians in the 9th century and used for long time.
CREDITS
Lord Calidor for his CBUR exclusive weapon pack.