
spoiler.
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her father is part of the imperial family, and there was something happened in the family a long time ago that resulted in him and his mother getting like kicked & banned out from the Empire. Thus, they moved to a another kingdom-- the one where Lady Isis's supposedly 'ally' from. And when Aria's father and mother met, it was when he like sneaked out / ran away for the mean time (i dont exacyly remember). The two met and are just like love at first sight. Then they spent some time together, but sht suddenly went down in the imperial family. He and his mother were then exiled from the empire and he disappeared without a message for Aria's mother. Also, Aria's mom doesn't know that he was a member of the imperial family at that time so she didn't know the actual reason of his sudden disappearance.

wait, huh? he was originally part of the imperial family before the drama decades earlier and got exiled. and adding up the judge is also an imperial family member (and they are blood-related). he was then removed as a member of the imperial family when he was exiled.
im not saying he's still an imperial in the current timeline BUT was a part of it before the imperial family drama decades ago ( ̄∇ ̄")
he's now a noble in the other kingdom tho
I wonder why she didn't end up with Aria's father