Millidiana Claes

 is Katarina Claes and Keith Claes' mother. She is comically shown to be constantly scolding Katarina when she acted out of her role as a noble.

History
Duchess Claes, also known as Miri Diana was married to Duke Luigi Claes which was not a marriage of love though not uncommon among the nobility. Miri Diana is the second daughter of Duke Ades, a family of equal standing to the Claes family, with tight, upturned eyes that caused her to be a little shy, their marriage was something that was decided for them. As Duke Ades asked Luigi Claes to take care of Miri Diana, Luigi was obligated to marry her when Duke Ades passed away.

It was as if the couple was both wearing masks, although not to the point where they hated each other, but Katarina felt as if they were unfriendly. That’s why, when looking at the young Keith and his eyes that were so similar to Luigi, it was whispered that Keith was the child of one of the Luigi's mistresses. Miri thought that Keith was her husband's illegitimate child due to that and she almost divorced her husband.