You then get into various early metal working, bronze age and eventually iron age cultures. Strangely, they haven't found much from the middle to late bronze age, so there is a bit of a gap where they don't have much information about who was living in this part of the world and what they were like.
In short order, you get to the Roman exhibits, which is the bulk of the museum. Niassus was a major Roman center and much has been found from the area and from the excavations of Mediana.

This soldier, guarding all the good stuff, is wearing a type of armor known as Lorica segmentata. Bits and pieces of it have been found from all over, but it wasn't until a bunch was found in a hoard at Corbridge along Hadrian's Wall that modern historians figured out how it all went together to work as a system of armor.

I saw that set of armor last year when visiting Corbridge on a day trip out from Hexham.

https://en.wikipedia.org/wiki/Lorica_segmentata

There is a model of Mediana and a bust of Constantine in the corner. The docent was nice enough to let me step over the red ropes and take a closer look at both.
Here are the baths, two banqueting halls and main reception halls of Constantine's villa.
Here is the man himself up close.

They've got a large collection of coins on display going back to Greek times, but also covering the Roman, Byzantine and Medieval Serbian periods.

Here is a coin of Galerius, whose palace Felix Romuliana I checked of earlier.

Also, a coin of Constantine. Think the coins match up to the busts?

They've got a bronze bust of an early Byzantine empress, as well. It is thought to be of either Euphemia (wife of Justin I) or Theodora (wife of Justinian).
Many Roman empresses had coins minted in their own right and ruled in various capacities while their husbands were away or even after they died.
Here are some of the "Big Name" emperors you may have heard of for famous and infamous reasons.

Anyways, enough coins. Lets get to other cool stuff.

Here is a statue of Hygeia in porphyry. She is the goddess from whom we get the word hygiene.

This is a section of bronze railing found at Mediana which appears to have enclosed a shrine to Hygiea in the main hall. The sections of railing are separated by what are called Herm sculptures of Lune (see the moon crescent?) and Asclepius, another major figure of the healing pantheon, from whom we get the near universal medical symbol of a serpent wrapped around a staff.

https://en.wikipedia.org/wiki/Rod_of_Asclepius

Herm statues have a square section topped with a head or head and torso and for male figures, you get genitals at the appropriate place jutting out from the square column. That's the case here with Ascelpius. These ones also have feet at the bottom.
Above the bronze railing, they have some sections of frescoes from the villa that gave them some hints at what one of the rooms may have looked like. This wasn't even a particularly fancy room in the villa, but it was near to the the sections used for imperial dining and receptions.
This is another Asclepius. He's holding an orb in his hand. The Galerius statue from Felix Romuliana was also doing the orb in hand thing.
Who is this? Not sure. Looks like she has a miniature calf in one arm and what the heck is dangling from the other. Looks like it has a tiny hand. A baby?
This is a small Chi Rho mosaic from one of the early Christian churches at Mediana.
Fancy jewelry and intaglios.
These are called Fibula(e), a type of brooch used to attach togas at up by your shoulder.
Some lamps of various types. The ones at the synagogue exhibit were generally much fancier, but it is possible that all the nice ones were stolen from Mediana where the Huns got to it.
Tiny little gladiator figure.