A beautiful woman.
It was said that Kieran's mother was even more beautiful than the current Queen. And while the current Queen was already more than a hundred years old, Kieran's mother Eleonor Vass was still in her thirties when she gave birth to Kieran. Because of this, the King spent a lot of time with Eleonor thinking that she would give birth to another child.
Though Queen Luna has been 'rumored' as the King's mate, the King would still spend nights away from her, which was something that any mate cannot just accomplish.
Of course, this didn't bother a lot of people as it was only rumored that the reason why Queen Luna gave birth first was that she was his mate.