@micha, our expert on this stuff is @eddiediz, but that first one looks like a Hungarian Quarting dating to between 1430 and 1437 AD. It would be attributed as Frynas H.27.14 and Huszar #586. These are pretty common, but it should be made from at least a little bit of silver (i.e. billon). Here are images of my example:
Your other coin is a Hungarian Denar.
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