Zubaidah bint Ja`far ibn al-Mansur () (died 26 Jumada I 216 AH / 10 July 831 CE) was the best known of the Abbasid princesses, and the wife and double cousin of Harun al-Rashid. She is particularly remembered for the series of wells, reservoirs and artificial pools that provided water for Muslim pilgrims along the route from Baghdad to Mecca and Medina, which was renamed the Darb Zubaidah in her honor. The exploits of her and her husband, Harun al-Rashid, form part of the basis for The Thousand and One Nights. Biography Zubaidah's birthdate is unknown; it is known that she was at least a year younger than Harun. Her father, Ja'far was a half-brother of the Abbasid caliph al-Mahdi. Her mother, Salsal, was an elder sister of al-Khayzuran, second and most powerful wife of al-Mahdi, and mother of the future caliphs Musa al-Hadi and Harun al-Rashid. Zubaidah is a pet name, given by her grandfather, caliph al-Mansur. The name means "little butter ball". Zubaidah's real name at birth was Sukhainah or Amat al-'Aziz". Later, Zubaidah got a kunya, Umm Ja'far (meaning Mother of Ja'far), which reflects her royal lineage as a granddaughter of caliph Abu Ja'far al-Mansur and a wife of caliph Abu Ja'far Harun al-Rashid. She was the granddaughter of the Abbasid caliph Al-Mansur, through his son Ja'far, and cousin of al-Rashid (763 or 766–809), who she later married (Dhu al-Hijjah 165 AH/July 782 CE). The Abbasid caliph Muhammad al-Amin, who had a double royal lineage, was Zubaidah's son. Her stepson was 'Abdullah al-Ma'mun, who also became a caliph after the civil war with al-Amin. It is said that Zubaidah's palace 'sounded like a beehive' because she employed one hundred women maids who had memorized the Qur'an. On her fifth pilgrimage to Mecca she saw that a drought had devastated the population and reduced the Zamzam Well to a trickle of water. She ordered the well to be deepened and spent over 2 million dinars improving the water supply of Makkah and the surrounding province. "This included the construction of an aqueduct from the spring of Hunayn, 95 kilometers to the east, as well as the famed "Spring of Zubayda" on the plain of Arafat, one of the ritual locations on the Hajj. When her engineers cautioned her about the expense, never mind the technical difficulties, she replied that she was determined to carry out the work "were