How did Theseus become king of Athens?

Theseus became king of Athens after a series of heroic exploits that demonstrated his strength and leadership. He is best known for his journey to Athens from Troezen, during which he defeated various bandits and monsters, showcasing his bravery. Upon arrival, he claimed his identity as the son of Aegeus, the king of Athens, and eventually proved himself worthy to rule by uniting the city and its surrounding regions. His reputation as a hero and unifier solidified his position as the king.