Arianna/Thea

The book I was reading contained information about prince Christopher, the heir of the lumina empire. 

Prince Christopher's life began under the shadow of both greatness and tragedy. Born to the esteemed monarchs, Queen Rosalind and King Pelisuiaus, his destiny was already intricately woven into the fabric of the Lumina Empire. Even at a young age, it was clear that he possessed a remarkable combination of power and intellect that set him apart from his peers. 

As the heir to the throne, Prince Christopher was believed to carry within him a potential that exceeded even that of his illustrious parents. His magical prowess and innate intelligence were evident even in his early years, a testament to his royal lineage. The hopes and expectations of an entire empire rested on his young shoulders.