Calca Bessarez (Overlord) - her flower tiara

Although her position in the line of succession to the throne was low, she obtained the throne with the support of the previous Holy King and the temple forces, thanks to her beautiful appearance known as the "Treasure of Roble" and her ability as a faith-based magic incantation user who can use fourth-tier magic at the age of 15. She has been running the country for about 10 years without any major mistakes, but there are still internal issues such as not being able to incorporate the southern region.