Who was the king of Aegina that saw ants transform into humans?

The king of Aegina who witnessed ants transforming into humans is Aeacus. In Greek mythology, Aeacus was known for his piety and was the son of Zeus and Aegina. According to the myth, the island of Aegina was afflicted by a plague, which led to a significant decline in its population. To help his people, Aeacus prayed to Zeus, who then turned the ants on the island into humans, known as the Myrmidons. This transformation not only restored the population but also endowed the Myrmidons with qualities of hard-working and industriousness, reflecting the characteristics of ants. Thus, Aeacus' connection to this transformation and his role as a king of Aegina directly relate to the question asked.