Lyab-i Hauz (from Persian: لب حوض meaning: by the pond), or Lyab-i Khauz, is the name of the area surrounding one of the few remaining hauz (ponds) that have survived in the city of Bukhara. Until the Soviet period there were many such ponds, which were the city's principal source of water, but they were notorious for spreading disease and were mostly filled in during the 1920s and 1930s. The Lyab-i Hauz survived because it is the centrepiece of a magnificent architectural ensemble, created during the 16th and 17th centuries, which has not been significantly changed since. The Lyab-i Hauz ensemble, surrounding the pond on three sides, consists of the Kukeldash Madrasah (1568-1569) (the largest in the city (on the north side of the pond), and of two religious edifices built by Nadir Divan-Beghi: a khanaka (1620) (a khanaka is a lodging-house for itinerant Sufis) and a madrasah (1622) (that stand on the west and east sides of the pond respectively. The small Qazi-e Kalyan Nasreddin madrasah (now demolished) was formerly located beside the Kukeldash madrasah.
The history of this ensemble is closely connected with the name of Nadir Divan-Beghi, who was an important grandee, vizier, and also an uncle of the Emir of Bukhara Imam Quli Khan. It is said that when Nadir Divan-Beghi built the Khanaka which bears his name, near the site of the building there was a large holding owned by an old Jewish widow. (There was a substantial population of Bukharan Jews.) Nadir Divan-Beghi had decided that this site would be the perfect place for a pond, but the widow turned down his offer to buy the property. Then Nadir Divan-Beghi brought her before Imam Quli Khan in the hope that the Emir would coerce her into selling. The Emir of Bukhara ordered a congress of muftis to inquire into the question. However, these specialists in Muslim law decided that there was no legal way to purchase the property, other than with the widow's consent, since Jews had rights on a par with Muslims if they paid the Jizyah or poll-tax on non-Muslims.
So, Nadir Divan-Beghi had to build a small reservoir near the house of that stubborn Jew. But he dug an aryk, an irrigation ditch, to his new pond in such a way that the water ran right near her house, although it was more expensive. Soon the water began to undermine the foundations of the widow's house. When she came to Nadir Divan-Beghi for justice, he confirmed his readiness to buy her house for a fair price. But widow rejected the money, laying down her own conditions instead. She promised give up her property if the Bukharan rulers would give to her another piece of land with permission to build a synagogue. In return for the widow’s holding Nadir Divan-Beghi gave her a plot of land, belonging to him, in a residential area, which later was named the Jewish quarter (Mahalli Kuma).
Soon the first synagogue at Bukhara and a large pond were built. People started to call it Lyab-i Hauz (see picture), which means in Persian "by the pond". The date of its construction is about 1620. But folk memory still retains another epithet – Haus-i Bazur, "made with force".
The madrasah was built in 1568-1569 and is the oldest building of the ensemble.
The Khanaka of Nadir Divan-begi (1619/20)
This Khanaka a rectangular edifice topped with a dome. The building has non-traditional narrow and prolate main portal along with two lateral entrances. The hall (dhikr-hana) has excellent acoustic properties. The inner walls of the hall are recessed with niches fringed with stucco moldings. The dwelling space occupies corners and lateral exterior walls of the building. The finishing of the main entrance gate is made quite conservatively, with an exception of some floral elements in ornamentation. The edges of the main portal are overworked with epigraphy ornaments. The main front of the khanaka is cornered with towers cut at a level of the walls.
The Madrasah of Nadir Divan-begi (1622/23)
Divan-begi is a title that designated the post right after khan in the Bukhara khanate. Nadir Divan-begi held this position during the reign of Imam Quli-khan (1611-1642), the strongest khan of the Ashtarkhanid (Janid) dynasty (established in 1599). The devotion to Islam tradition in the state under Janid dynasty was pale before the eagerness of the time of prominent Shaibanid khans. These two important peculiarities of the power were soon expressed in remarkable architecture tendency. In 1619 Yalantush-biy who virtually independently governed Samarkand had begun the construction of Sher-Dor Madrasah. The rich colored finishing and the depiction of sun, tigers and antelopes tell of a pioneering approach to artistic expression, unique in the Islamic world. In three years Nadir Divan-begi had followed Yalantush-biy by construction of his own revolutionary structure (Nadir Divan-Begi Madrasah). The entrance portal has depictions of 2 phoenix birds, 2 misshapen white deer and a "man-in-the-sun" face. 
Magak-i Attari Mosque
Before the construction of the first synagogue Jews had shared a place in a mosque with Muslims. This mosque was called Magak-i Attari (see picture), i.e. "the mosque in a pit". Some say that Bukharian Jews and Muslims worshipped alongside each other in the same place at the same time. Other sources insist that Jews worshipped after Muslims.
Before the Arab conquest there was a bazaar on the site of Magak-i Attari. It was a market for idols, potions and spices – attar (perfumes) and other goods. Besides this, there was formerly a Temple of the Moon (Mokh) close to this place. Narshakhi, in his History of Bukhara (ca. 950), named the mosque built on the site of the former temple "magok", i.e. "in a pit", because even then half of it was concealed from view by the rising soil level.
Today the Lyab-i Hauz is a right-angled pond (46 x 36 meters), which stretches from the east to the west and is buried in the verdure of century-old trees. Its edges are arranged in the form of the descending staircase made of massive blocks of yellowish limestone.
As stated above the Kukeldash Madrasah is the biggest in Bukhara (80 x 60 meters). Kulbala Kukeldash ('the brother') was the name of the Emir's foster-brother who was the builder of this structure.
The Nadir Divan-Beghi Madrasah was initially erected as a caravanserai. At the inauguration ceremony Imam Quli Khan unexpectedly proclaimed the supposed caravanserai is to be a madrasah. So Nadir Divan-Beghi was obliged to rearrange the caravanserai by adding on to the front the loggias, the portal (Aywan) and angular towers. He also constructed an additional storey with cells.
The Nadir Divan-Beghi Khanaka is located opposite the Nadir Divan-Beghi Madrasah on the western side of the Lyab-i Hauz.
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