Sebastian of Portugal was a young king who ruled from 1557 until his mysterious disappearance in 1578. He became king at just 14 years old and was known for his adventurous spirit and desire to expand the Portuguese Empire. His reign was marked by ambitious military campaigns, particularly in North Africa, where he aimed to reclaim territories. Tragically, Sebastian's life took a dramatic turn during the Battle of Alcácer Quibir, where he led an ill-fated expedition against the Moroccan forces. After his defeat, he vanished without a trace, leading to speculation about his fate. His disappearance left Portugal in a state of uncertainty, eventually leading to a dynastic crisis.