u/According-Hat-8521

Hi! I’ve been looking into medieval art lately but I’ve been struggling to identify a lot of the figures in artworks (I was never given a religious education so I’m unsure as to whether they are biblical characters or just random figures a lot of the time). I was wondering if anyone knew anything about the figures in this folio from the Psalter of Bonne de Luxembourg? (The two on either side of the coat of arms and also the one with the ladder - maybe a hybrid because of his legs?)