This article documents the history of Baghdad. Baghdad (Arabic: بغداد‎ Baġdād) is the capital of Iraq and of Baghdad Governorate. With a metropolitan area estimated at a population of 7,000,000, it is the largest city in Iraq. It is the second-largest city in the Arab world (after Cairo) and the second-largest city in Southwest Asia (after Tehran).

On 30 July 762 the caliph Al-Mansur commissioned the construction of the city and it was built under the supervision of the Barmakids. Mansur believed that Baghdad was the perfect city to be the capital of the Islamic empire under the Abbasids. Mansur loved the site so much he is quoted saying, "This is indeed the city that I am to found, where I am to live, and where my descendants will reign afterward". The goal was to replace Harran as the seat of the caliphal government; however, a city of Baghdad is mentioned in pre-Islamic texts, including the Talmud, and the Abbasid city was likely built on the site of this earlier settlement.

Baghdad eclipsed Ctesiphon, the capital of the Persian Empire, which was located some 30 km (19 mi) to the southeast, which had been under Muslim control since 637, and which became quickly deserted after the foundation of Baghdad. The site of Babylon, which had been deserted since the 2nd century BC, lies some 90 km (56 mi) to the south.

Baghdad (Arabic: بغداد‎, Baġdād, IPA: [bæɣˈdæːd]) is the capital of Republic of Iraq, as well as the coterminous Baghdad Province. The population of Baghdad as of 2011 is approximately 7,216,040, making it the largest city in Iraq, the second largest city in the Arab World (after Cairo, Egypt), and the second largest city in Western Asia (after Tehran, Iran).

Located along the Tigris River, the city was founded in the 8th century and became the capital of the Abbasid Caliphate. Within a short time of its inception, Baghdad evolved into a significant cultural, commercial, and intellectual center for the Islamic World. This in addition to housing several key academic institutions (e.g. House of Wisdom) garnered the city a worldwide reputation as the "Center of Learning". Throughout the High Middle Ages, Baghdad was considered to be the largest city in the world with an estimated population of 1,200,000 people. The city was largely destroyed at the hands of the Mongol Empire in 1258, resulting in a decline that would linger through many centuries due to frequent plagues and multiple successive empires. With the recognition of Iraq as an independent state (formerly the British Mandate of Mesopotamia) in 1938, Baghdad gradually regained some of its former prominence as a significant center of Arabic culture.

Guru Nanak (Punjabi: ਗੁਰੂ ਨਾਨਕ; Hindi: गुरु नानक, Urdu: گرونانک [ˈɡʊɾu ˈnɑnək] Gurū Nānak) (15 April 1469 – 22 September 1539 at Talwandi (present-day Pakistan)) was the founder of the religion of Sikhism and the first of the ten Sikh Gurus.

The Sikhs believe that all subsequent Gurus possessed Guru Nanak’s divinity and religious authority, and were named "Nanak" in the line of succession.

Guru Nanak was born on 15 April 1469, now celebrated as Prakash Divas of Guru Nanak Dev, into a Hindu Khatri family in the village of Rāi Bhōi dī Talwandī, now called Nankana Sahib, near Lahore, Pakistan. Today, his birthplace is marked by Gurdwara Janam Asthan. Some are of the opinion that 20 October is his enlightenment day rather than his birthday. His father, Kalyan Chand Das Bedi, popularly shortened to Kalu Mehta, was the patwari (accountant) of crop revenue for the village of Talwandi in the employment of a Muslim landlord of that area, Rai Bular Bhatti. Guru Nanak’s mother was Tripta Devi and he had one elder sister, Bibi Nanaki who became a spiritual figure in her own right.

Abd al-Qadir al-Gilani (Kurdish: Evdilqadirê Geylanî, Persian: عبد القادر گیلانی‎,Urdu: عبد القادر آملی گیلانی Abdolqāder Gilāni) (also spelled Abdulqadir Gaylani, Abdelkader, Abdul Qadir, Abdul Khadir - Jilani, Jeelani, Gailani, Gillani, Gilani, Al Gilani, Keilany) (470–561 AH) (1077–1166 CE) was a Kurdish or PersianIslamic preacher who is highly esteemed by Sunni scholars. Sheikh Abdul Qadir is considered the patron Saint of the Kurds and is held in great veneration by the Muslims of the Indo-Pak sub-continent. Among followers in Pakistan and India, he is also known as Ghaus-e-Azam. He was born on a Wednesday the 1st of ramadan in 470 AH, 1077 CE south of the Caspian Sea in what is now the Mazandaran Province of Iran.

Al-Gilani was born in 1078 CE (471 AH)1st of ramadan and died 11 rabi usani in a small town of Gilan Province.

His complete name al-Sayyid Muhiyudin Abu Muhammad Abdal Qadir al-Jilani al-Hasani wal-Hussaini,Sayyid denoting his descent from Muhammad,Muhiyudin the title "Reviver of Religion", al-Jilani his home region, although however he also had the epithet al-Baghdadi. (denoting also the city of Baghdad where he was now residing in and therefore also geographically recognised through, eventually being buried there), and al-Hasani wal-Hussaini affirming his lineal descent from both Hasan ibn Ali and Hussein ibn Ali, the grandsons of Muhammad.