I'm struggling with the translation of the following sentence:
Praeterea quinque milia iuvenum iussu principis magna voce plaudere debebant.
It is not clear to me what to do with the word iuvenum, that I think would be "young" here. I believe it is Gen.Pl. but neither the milia nor principis agree with that. The milia, as far as I can tell, are in Nom. and the principis is singular. So I don't know who/what should be "young" here?