Roman coins - are they false or not

Who can identify these twelve Roman coins?

I doubt if they are real so please tell me how to determine this.

Nobody nows?

Since no one answered I'll give it a go and say yes, I think they're real. The ones in the first row seem to be sestertius, I don't know about the first one (it might not even be Roman) but the second one is Severus Alexander while the third is Gordianus III.

In the second row the first one is Roman but I can't identify it while the other 4 might be Roman but could also be from other ancient countries.

Third row are all Romans.

Nice coins, especially the two sestertius in the first row.

Hi,

The first in the first row is a bronze from egypt. One of the Ptolemaic kings.
Second row : first is roman (julio-claudian dynasty), second is not, third is not (probably greek), fourth is provincial roman (I think minted in Alexandria), fifth is probably not roman.
Third row : roman (Licinius), provincial (Diocletian?), roman (Constantine I), provincial (Diocletian).

All genuine.

The last one, bottom row, is an Egyptian "tetradrachm" of Diocletian (ΔΙΟΚΛΗΤΙΑΝΟC) struck during his first year of reign (LA on reverse). It is very thick, right?