Five ancient coins (maybe Judea???)

Dear colleagues, I need your help with five coins, which I bought. Here are details:

1. 11,85 g, 22 mm, flan 3 mm, copper, flower in eight-pointed star
2. 1,08 g, 17 mm, thin flan, copper, cross in six-pointed star
3. 0,76 g, 15 mm, thin flan, copper, ???
4. 0,98 g, 12 mm, thin flan, copper, head
5. 3,27 g, 12 mm, very thick flan = 4 mm, ???

Photos are attached below.

Thank you very much in advance!!

Gandy

Hello,

4 is a coin of Arcadius, reverse SALVS REIPVBLICAE.