
I think its the original being that was able to "control" the divine beasts. I forgot her name.
It was why it is believed those with blonde hair and golden eyes are descended from her.
Blondina's mother had these traits which is why Blondina's father pursued but it became clear she had no powers or abilities so he ditched her.

I think he was attracted to her but based on how he treated her I dont think it was love.
He pursued her because she had gold eyes and blonde hair the traits associated with being descended from "the one that control the divine beasts."
When it became obvious she didn't have any abilities he left her under false pretense he would return.
And more or less forgot her , after he became emperor and started a new family with his high born wife.

More context on the dream;
It's a past memory from Blondina and Amon's past life.
She is the reincarnation of the Goddess of Origins the one who gave divinity to the beasts and when she wanted to live her a as human with "amon" in the forest she passed on her powers to Barahan (the one with blonde hair gold eyes).
The kid Adellai encounters in the jail is his reincarnation. Barahan was in love with the goddess but she did not reciprocate and when he found out she loved another in a jealous rage he killed her.
And the Black Leopard (past life Amon) kills him.
This was the start of the war and bad blood between Shinsu and humans.
Wait that dream, is that Blondina's Mother??????????? Or im just thinking