>prima noctis was a myth. It is ius primae noctis (still there is no evidence it ever existed) or "right of the first night". "prima noctis" doesn't make much

>prima noctis was a myth. It is ius primae noctis (still there is no evidence it ever existed) or "right of the first night". "prima noctis" doesn't make much sense in Latin, it lacks the subject (ius aka right) and prima is not genitive as noctis is. It would make sense in expressions like "hora prima noctis" or "vigilia prima noctis" which translates to first hour (or vigilia, i.e. turn of vigilance, three hours long roughly) of the night and more loosely "just after sunset".