Sentenia Antiquae did a great article on the Trojan princess Polyxena.
I can only add that supposedly, Polyxena was Achilles' bride in the other world. (See Philostratus, Her. xx.18; Philostratus, Vit. Apollon.iv.16.). Of course Medeia (Schol. ad Eurip. Med. 10, ad Apollon. Rhod. iv. 814.), Iphigenia (Anton. Lib. 27.) and Helen (Ptolemy Hephaestion, New History Book 4) all claim the title of Mrs. Achilles in the Afterworld too.