Handan Sultan (fully Devletlu İsmetlu Handan Valide Sultan Aliyyetü'ş-Şân Hazretleri; ca. 1574 – 26 November 1605)(Handan meaning "Joyful") was the mother of the Ottoman Sultan Ahmed I and his Valide Sultan from 21 December 1603 until 26 November 1605. She was originally a Greek Orthodox Christian named Helena. During the first two years of the reign of Sultan Ahmed I, she was the Vâlidā Sultâna, being his mother.The contemporary historian Ibrahim Pecevi questioned her wisdom.