As far as I can tell, none of them are Byzantine; all four coins have legends in Arabic script on both sides, which is a feature of Islamic rather than Byzantine coinage.
Unfortunately my knowledge of Arabic script only goes about far enough to distinguish it from (most) other scripts, so I have no idea where the coins are actually from. They don't look very early or very late, so maybe 10th-16th century (ish), probably Middle East but maybe India or North Africa.
Size and weight measurements would probably be very helpful for further ID. There are a few CCF members who can read Arabic and they might also be able to help.
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