Artemis was a popular and widely-worshiped deity across the Hellenic world. Besides hunting, she ruled over forests and wild beasts, archery and disease. She was also a protector of young and unmarried women.
When the Titan Leto found safe haven on Delos to give birth, Artemis was born first. The young goddess immediately assisted her mother with the birth of her twin Apollo, and from then on she assumed the role of Goddess of Childbirth.
Artemis from God of War wiki