In some traditions, Helen was of childbearing age when Theseus abducted her and actually bore him a daughter named Iphigenia. When Helen returned to Sparta, she gave Iphigenia to her sister Clytemnestra to raise. Later, Iphigenia was sacrificed by Clytemnestra’s husband Agamemnon so that the Greeks could appease the gods and sail to Troy. More @Wikipedia
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