Hijri year in the context of "Ibn Butlan"

The Citadel of Qaitbay (or the Fort of Qaitbay; Arabic: قلعة قايتباي) is a 15th-century defensive fortress located on the Mediterranean sea coast, in Alexandria, Egypt. It was built from 1477 to 1479 AD (882–884 AH) by Sultan Al-Ashraf Sayf al-Din Qa'it Bay. The Citadel is situated on the eastern side of the northern tip of Pharos Island at the mouth of the Eastern Harbour.

A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 December 2025" is ten days after "15 December 2025". The date of a particular event depends on the time zone used to record it. For example, the air attack on Pearl Harbor that began at 7:48 a.m. local Hawaiian time (HST) on 7 December 1941 is recorded equally as having happened on 8 December at 3:18 a.m. Japan Standard Time (JST).

A particular day may be assigned a different nominal date according to the calendar used. The de facto standard for recording dates worldwide is the Gregorian calendar, the world's most widely used civil calendar. Many cultures use religious calendars such as the Gregorian (Western Christendom, AD), the Julian calendar (Eastern Christendom, AD), Hebrew calendar (Judaism, AM), the Hijri calendars (Islam, AH), or any other of the many calendars used around the world. Regnal calendars (that record a date in terms of years since the beginning of the monarch's reign) are also used in some places, for particular purposes.

The Islamic New Year (Arabic: رأس السنة الهجرية, Raʿs as-Sanah al-Hijrīyah), also called the Hijri New Year, is the day that marks the beginning of a new lunar Hijri year, and is the day on which the year count is incremented. The first day of the Islamic year is observed by most Muslims on the first day of the month of Muharram. The epoch (reference date) of the Islamic era was set as the year of the emigration of Muhammad and his followers from Mecca to Medina, known as the Hijrah, which equates to 622 CE in the Gregorian calendar. All religious duties, such as prayer, fasting in the month of Ramadan, and pilgrimage, and the dates of significant events, such as celebration of holy nights and festivals, are calculated according to the Islamic calendar. Hijri New Year is observed by 24 countries as a public holiday.

While some Islamic organizations prefer determining the new month (and hence the new year) by local sightings of the moon, most Islamic institutions and countries, including Saudi Arabia, follow astronomical calculations to determine future dates of the Islamic calendar. There are various schemas for calculating the tabular Islamic calendar (i.e. not based on observation), which results in differences of typically one or even two days between countries using such schema and those that use actual lunar sightings. For example, the Umm al-Qura calendar used in Saudi Arabia was reformed several times in recent years. The current scheme was introduced in 1423 AH (15 March 2002).

Ibn Khaldun (27 May 1332 – 17 March 1406, 732–808 AH) was an Arab Islamic scholar, historian, philosopher, and sociologist. He is widely acknowledged to be one of the greatest social scientists of the Middle Ages, and considered by a number of scholars to be a major forerunner of historiography, sociology, economics, and demography studies.

His best-known book is the Muqaddimah or Prolegomena ("Introduction"), which he wrote in six months as he states in his autobiography. It later influenced 17th-century and 19th-century Ottoman historians such as Kâtip Çelebi, Mustafa Naima and Ahmed Cevdet Pasha, who used its theories to analyze the growth and decline of the Ottoman Empire. Ibn Khaldun interacted with Tamerlane, the founder of the Timurid Empire.

The Battle of Mu'tah (Arabic: مَعْرَكَة مُؤْتَة, romanized: Maʿrakat Muʿtah, or Arabic: غَزْوَة مُؤْتَة Ghazwat Muʿtah) took place in September 629 (1 Jumada al-Awwal 8 AH), between the forces of Muhammad and the army of the Byzantine Empire and their Ghassanid vassals. It took place in the village of Mu'tah in Palaestina Salutaris at the east of the Jordan River and modern-day Karak.

In Islamic historical sources, the battle is usually described as the Muslims' attempt to take retribution against a Ghassanid chief for taking the life of an emissary. According to Byzantine sources, the Muslims planned to launch their attack on a feast day. The local Byzantine Vicarius learned of their plans and collected the garrisons of the fortresses. Seeing the great number of the enemy forces, the Muslims withdrew to the south where the fighting started at the village of Mu'tah and they were either routed or retired without exacting a penalty on the Ghassanid chief. According to Muslim sources, after three of their leaders were killed, the command was given to Khalid ibn al-Walid and he succeeded in saving the rest of the force.

The Battle of Karbala (Arabic: مَعْرَكَة كَرْبَلَاء, romanized: Maʿrakat Karbalāʾ) was fought on 10 October 680 (10 Muharram in the year 61 AH of the Islamic calendar) between the army of the second Umayyad caliph Yazid I (r. 680–683) and a small army led by Husayn ibn Ali, the grandson of the Islamic prophet Muhammad, at Karbala, Sawad (modern-day southern Iraq).

Prior to his death, the Umayyad caliph Mu'awiya I (r. 661–680) had nominated his son Yazid as his successor. Yazid's nomination was contested by the sons of a few prominent companions of Muhammad, including Husayn, son of the fourth caliph Ali, and Abd Allah ibn al-Zubayr, son of Zubayr ibn al-Awwam. Upon Mu'awiya's death in 680, Yazid demanded allegiance from Husayn and other dissidents. Husayn did not give allegiance and traveled to Mecca. The people of Kufa, an Iraqi garrison town and the center of Ali's caliphate, were averse to the Syria-based Umayyad caliphs and had a long-standing attachment to the house of Ali. They proposed Husayn overthrow the Umayyads. On Husayn's way to Kufa with a retinue of about 70 men, his caravan was intercepted by a 1,000-strong army of the caliph at some distance from Kufa. He was forced to head north and encamp in the plain of Karbala on 2 October, where a larger Umayyad army of 4,000 arrived soon afterwards. Negotiations failed after the Umayyad governor Ubayd Allah ibn Ziyad refused Husayn safe passage without submitting to his authority, a condition declined by Husayn. Battle ensued on 10 October during which Husayn was killed along with most of his relatives and companions, while his surviving family members were taken prisoner. The battle was the start of the Second Fitna, during which the Iraqis organized two separate campaigns to avenge the death of Husayn; the first one by the Tawwabin and the other one by Mukhtar al-Thaqafi and his supporters.

Abū al-Ḥusayn Muslim ibn al-Ḥajjāj ibn Muslim ibn Ward al-Qushayrī an-Naysābūrī (Arabic: أبو الحسين مسلم بن الحجاج بن مسلم بن وَرْد القشيري النيسابوري; after 815 – May 875 CE / 206 – 261 AH), commonly known as Imam Muslim, was an Islamic scholar from the city of Nishapur, particularly known as a muhaddith (scholar of hadith). His hadith collection, known as Sahih Muslim, is one of the six major hadith collections in Sunni Islam and is regarded as one of the two most authentic (sahih) collections, alongside Sahih al-Bukhari.

The gold dinar (Arabic: ﺩﻳﻨﺎﺭ ذهب) is an Islamic medieval gold coin first issued in AH 77 (696–697 CE) by Caliph Abd al-Malik ibn Marwan. The weight of the dinar is 1 mithqal (4.25 grams or 0.137 troy ounces).

The word dinar comes from the Latin word denarius, which was a silver coin. The name "dinar" is also used for Sasanid, Kushan, and Kidarite gold coins, though it is not known what the contemporary name was.