Spoilers (though I don't know much detail, since I didn't get this far when I was reading the novel)
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I don't think Ahuin fakes Noelle's death (since I don't remember him going back to the empire until the war later on). The fake Saintess experiences a clean sweep, since of the three Wings she sent as escorts, not one of them came back to her.
Also, Julius is a Wing with the ability to see the future. And yes, according to the rules of Wings, he will be reincarnated some time in the future (the novel doesn't touch on his or anyone else's next life).
Of course, before that, Julius is going to be resurrected as he was and continue to live on with everybody as Leticia's Wing and have a happy life.
Oh my! Thank you for the spoiler! I'm so happy for Julius. His death in the hands of the fake Saintess breaks my heart.
Also will Ahuin fake Noelle's death so she can go with Leticia back to Principality?
I also really feel bad for Julius' death. If only getting inside the novel is possible, he's the first one I'll save.. is he somehow a wing and will reincarnate again? I hope so but he is of dragon descendant, right?