Roman, Egyptian(?), Byzantine, Celtic(?)

I'm struggling to identify these 5 coins:


1 - Rome - 26,15 g / 28 mm


2 - Egypt(?) - 17,24 g / 26 mm


3 - Byzantine - 6,4 g / 25 mm


4 - Byzantine - 6,4 g / 25 mm


5 - Celtic(?) - 9,68 g / 23 mm

Any help would be appreciated. Thank you in advance.

Hi,

#3 is a follis of Leon VI
https://en.numista.com/catalogue/pieces19712.html

#1 is an as from Sextus Pompey I think. See here for exact variant :
http://www.wildwinds.com/coins/imp/sextus_pompey/t.html

#4 is also a follis of Leon VI but overstruck on another follis I can't determine. Reverse looks the same twice.

#2 is this one I think :
https://en.numista.com/catalogue/pieces48781.html

Verweis : "Choucas"​Hi,
​
​#2 is a follis of Leon VI
​https://en.numista.com/catalogue/pieces19712.html
​
​#1 is an as from Sextus Pompey I think. See here for exact variant :
​http://www.wildwinds.com/coins/imp/sextus_pompey/t.html
​
​#4 is also a follis of Leon VI but overstruck on another follis I can't determine. Reverse looks the same twice.
​
​#2 is this one I think :
​https://en.numista.com/catalogue/pieces48781.html

​Thank you.

So only #5 remains "opened".

#5 is in my opinion from Celtic Danube, something like: https://en.numista.com/catalogue/pieces38965.html or https://en.numista.com/catalogue/pieces38966.html

Verweis : "cro321"​#5 is in my opinion from Celtic Danube, something like: https://en.numista.com/catalogue/pieces38965.html or https://en.numista.com/catalogue/pieces38966.html

​Thanks!

According to the weight, it's more likely to be a tetradrachm, made of billon. Cro321 is right, it looks like the danube celts.
Some similar tetradrachm :
https://www.numisbids.com/n.php?p=lot&sid=1969&lot=21

This one is the closest i found in style :
https://www.acsearch.info/search.html?id=40498