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Pindar's fragments

Pindar is the earliest source who explicitly calls Apollo and Artemis as twins. Here, Asteria is also stated to be Leto's sister. Wanting to escape Zeus' advances, she flung herself into the sea and became a floating rock called Ortygia until the twins were born. When Leto stepped on the rock, four pillars with adamantine bases rose from the earth and held up the rock. When Apollo and Artemis were born, their bodies shone radiantly and a chant was sung by Eileithyia and Lachesis, one of the three Moirai.