[TigersEye]

Here is a collection of Byzantine maces and war axes.

Byzantine Roman Collection

The war mace, already used from the Late Roman Army at least since the 3rd century AD, composed by a wooden shaft and a metallic head, was transformed in the middle age of Byzantium as the favorite weapon of the heavy armed cavalryman, used with devastating effects on the battlefields.

[Antoninus]

Here is a collection of Byzantine maces and war axes.

How interesting. Thanks for the link!

I have never encountered a mention of Roman war maces in the documentary sources before the 7th century. Of course, axes are attested in pre-Byzantine Roman sources, but not as standard military issue from what I've seen. Based on the site you linked to, I have to assume they were still uncommon before the 7th century, though not non-existent. They seemed to be much more prevalent among the Germanic auxiliaries which would make sense.