Next 2 are both similar, probably Ptolemaic Egypt. These did not come up in the right order, #1 goes with #4.
The first design was used for Byzantine, Bulgaria, Venice, and others. I would guess Venice off hand, without getting the books out, especially with the left figure not facing front.
The first one is a Venetian Grosso of the Doge Andrea Contarini, 1367-1382. The obverse features an enthroned Christ, the reverse depicts the doge of Venice and St. Mark holding a banner. The second is the Tetrarchy emperor Maximian, from his first reign (as Western Augustus opposite Diocletian in the east) 286-305. The obverse features a radiate bust in keeping with the dying days of the antoninianus. The reverse shows Jupiter handing Victory to Maximian.
kkYes, the last one does have the look of a bactrian piece. The reverse seems like Azez II, but the overse does not seem to match.