Title: Dome of the Rock
Content:  The Dome of the Rock (قبة الصخرة) is an Islamic shrine located on the Temple Mount in the Old City of Jerusalem. It was initially completed in 691–92 CE at the order of Umayyad Caliph Abd al-Malik during the Second Fitna on the site of the Second Jewish Temple, destroyed during the Roman Siege of Jerusalem in 70 CE. The original dome collapsed in 1015 and was rebuilt in 1022–23. The Dome of the Rock is in its core one of the oldest extant works of Islamic architecture. Its architecture and mosaics were patterned after nearby Byzantine churches and palaces, although its outside appearance has been significantly changed in the Ottoman period and again in the modern period, notably with the addition of the gold-plated roof, in 1959–61 and again in 1993. 
Title: Dome of the Rock
Content:  The initial octagonal structure of the Dome of the Rock and its round wooden dome had basically the same shape as is does today. It was built by the order of the Umayyad caliph Abd al-Malik ((r. 685 – 705)). According to Sibt ibn al-Jawzi (1185–1256), construction started in 685/86, while al-Suyuti (1445–1505) holds that its commencement year was 688. A dedicatory inscription in Kufic script is preserved inside the dome. The date is recorded as AH 72 (691/2 CE), the year most historians believe the construction of the original Dome was completed. An alternative interpretation of the inscription claims that it indicates the year when construction started. In this inscription, the name of "al-Malik" was deleted 
Title: 691
Content: The Dome of the Rock is completed in Jerusalem (under the patronage of Abd al-Malik) during the Second Fitna, becoming the first work of Islamic architecture. 
Title: Dome of the Rock
Content:  The building was severely damaged by earthquakes in 808 and again in 846. The dome collapsed in an earthquake in 1015 and was rebuilt in 1022–23. The mosaics on the drum were repaired in 1027–28.
Title: Dome of the Rock
Content:  During the reign of Suleiman the Magnificent (1520–1566), the exterior of the Dome of the Rock was covered with tiles. This work took seven years. Some of the interior decoration was added in the Ottoman period. Adjacent to the Dome of the Rock, the Ottomans built the free-standing Dome of the Prophet in 1620. Large-scale renovation was undertaken during the reign of Mahmud II in 1817. In a major restoration project undertaken in 1874–75 during the reign of the Ottoman Sultan Abdülaziz, all the tiles on the west and southwest walls of the octagonal part of the building were removed and replaced by copies that had been made in Turkey.
Title: Dome of the Rock
Content:  The interior of the dome is lavishly decorated with mosaic, faience and marble, much of which was added several centuries after its completion. It also contains Qur'anic inscriptions. They vary from today's standard text (mainly changes from the first to the third person) and are mixed with pious inscriptions not in the Quran. The dedicatory inscription in Kufic script placed around the dome contains the date believed to be the year the Dome was first completed, AH 72 (691/2 CE), while the name of the corresponding caliph and builder of the Dome, al-Malik, was deleted and replaced by the name of Abbasid caliph Al-Ma'mun (r. 813–833) during whose reign renovations took place.
Title: Dome of the Rock
Content:  replaced by the name of the Abbasid caliph al-Ma'mun ((r. 813 – 833)). This alteration of the original inscription was first noted by Melchior de Vogüé in 1864. Some scholars have suggested that the dome was added to an existing building, built either by Muawiyah I (r. 661–680), or indeed a Byzantine building dating to before the Muslim conquest, built under Heraclius (r. 610–641). The Dome of the Rock's architecture and mosaics were patterned after nearby Byzantine churches and palaces. The supervisor and engineer in charge of the project were Raja ibn Haywa, Yazid ibn Salam, and the latter's son Baha. Raja was a Muslim theologian and native of Beisan, and Yazid and Baha were mawali 
Title: History of medieval Arabic and Western European domes
Content:  or "golden reception hall", of the Great Palace of Constantinople. It has also been proposed that descriptions by returning travelers of the Dome of the Rock in Jerusalem, which was thought to have been the Temple of Solomon, served as the model. It was built at Charlemagne's palace at Aachen between 789 and its consecration in 805. The architect is thought to be Odo of Metz, although the quality of the ashlar construction has led to speculation about the work of outside masons. The octagonal domical vault measures 16.5 meters wide and 38 meters high. It was the largest dome north of the Alps at 
Title: Dome of the Rock
Content:   Haj Amin al-Husseini, appointed Grand Mufti by the British in 1917, along with Yaqub al-Ghusayn, implemented the restoration of the Dome of the Rock and the Al-Aqsa Mosque in Jerusalem. Parts of the Dome of the Rock collapsed during the 11 July 1927 earthquake, and the walls were left badly cracked, damaging many of the repairs that had taken place over previous years.
Title: History of medieval Arabic and Western European domes
Content:   The Dome of the Rock in Jerusalem, the earliest surviving Islamic building, was completed in 691 by Umayyad caliph Abd Al-Malik. Its design was that of a ciborium, or reliquary, such as those common to Byzantine martyria and the major Christian churches of the city. The rotunda of the nearby Church of the Holy Sepulchre, in particular, has a similar design and almost the same dimensions. The building was reportedly burned in the eleventh century and then rebuilt, which would still make it one of the oldest timber buildings in the world. The dome, a double shell design made of wood, is 20.44 meters in diameter. The dome's bulbous shape "probably dates 

Question: when was the dome of the rock completed?
Answer: 691 CE.
in 691 CE.