This is mostly a post-medieval weapon but it's a direct development of the medieval sword.
At about 6 foot long this was a serious weapon.
These were used most famously by the Landsknecht, professional German soldiers in the late 15th and 16th centuries.
The biggest misconception about weapons like this is that they were heavy and slow, but in fact they topped out at about 3kg, a perfectly manageable weight with 2 hands.
Despite what you might think from Skyrim these swords can be swung very fast. The very long hilt (over a foot) acted as a lever helping the blade to move very quickly and delivering furious blows. The men that used these needed all the power they could get because they were assigned the task of breaking into pike blocks (large formations of soldiers armed with spears 15-20 feet in length).