Mu'tazilism in the context of Rationalism

Islamic philosophy is philosophy that emerges from the Islamic tradition. Two terms traditionally used in the Islamic world are sometimes translated as philosophy—falsafa (lit. 'philosophy'), which refers to philosophy as well as logic, mathematics, and physics; and kalam (lit. 'speech'), which refers to a rationalist form of Scholastic Islamic theology which includes the schools of Ash'arism, Maturidism and Mu'tazilism.

Early Islamic philosophy began with al-Kindi in the 2nd century of the Islamic calendar (early 9th century CE) and declined with Ibn Rushd (Averroes) in the 6th century AH (late 12th century CE), broadly coinciding with the period known as the Islamic Golden Age. The death of Ibn Rushd effectively marked the end of a specific discipline of Islamic philosophy usually called the Islamic peripatetic school, and philosophical activity declined significantly in the west of the Islamic world, including al-Andalus and the Maghreb.

Ilm al-kalam or ilm al-lahut, often shortened to kalam, is the scholastic, speculative, or rational study of Islamic theology (aqida). It can also be defined as the science that studies the fundamental doctrines of Islamic faith (usul al-din), proving their validity, or refuting doubts regarding them rationally via logic. Kalām was born out of the need to establish and defend the tenets of Islam against philosophical doubters and non-Muslims, and also to defend against heretical and religious innovations (bidʿah). A scholar of kalam is referred to as a mutakallim (plural mutakallimun), a role distinguished from those of Islamic philosophers and jurists.

After its first beginnings in the late Umayyad period, the Kalām experienced its rise in the early Abbasid period, when the Caliph al-Mahdi commissioned Mutakallimūn to write books against the followers of Iranian religions, and the Barmakid vizier Yahya ibn Khalid held Kalām discussions with members of various religions and confessional groups in his house. By the 10th century, the Muʿtazilites were main pioneers of 'Kalam' during the early formative period of Islam. However, due to increased criticism by traditionalist Muslim scholars that the Mu'tazilites started departing from mainstream Sunni orthodoxy, they were refuted heavily. Soon after, two new important Sunni Kalām schools emerged: the Ashʿaris and the Maturidis. They positioned themselves against the growing Neoplatonic and Aristotelian philosophy within the Mu'tazilites and elevated the "Kalām science" (ʿilm al-kalām) as an acceptable ranking science in mainstream Sunni discourse. Some of the arguments of these Mutakallimūn also found their way into Jewish and Christian theological discussions in the Middle Ages. Kalām science by the early modern period was essentially limited to the study of manuals and commentaries, from the late 19th century onwards various reform thinkers appeared in British India and the Ottoman Empire who called for the founding of a "new Kalām".

Schools of Islamic theology are various Islamic schools and branches in different schools of thought regarding creed. The main schools of Islamic theology include the extant Mu'tazili, Ash'ari, Maturidi, and Athari schools; the extinct ones include the Qadari, Jahmi, Murji', and Batini schools.

The main schism between Sunni, Shia, and Khariji branches of Islam was initially more political than theological, but theological differences have developed over time throughout the history of Islam.

The Aghlabid dynasty (Arabic: الأغالبة) was an Arab dynasty centered in Ifriqiya (roughly present-day Tunisia) from 800 to 909 that conquered parts of Sicily, Southern Italy, and possibly Sardinia, nominally as vassals of the Abbasid Caliphate. The Aghlabids were from the tribe of Banu Tamim and adhered to the Mu'tazilite rationalist doctrine within Hanafi Sunni Islam, which they imposed as the state doctrine of Ifriqiya. They ruled until 909 when they were conquered by the new power of the Fatimids.

Abū al-ʿAbbās Abd Allāh ibn Hārūn al-Maʾmūn (Arabic: أبو العباس عبد الله بن هارون الرشيد, romanized: Abū al-ʿAbbās ʿAbd Allāh ibn Hārūn ar-Rashīd; 14 September 786 – 9 August 833), better known by his regnal name al-Ma'mun (Arabic: المأمون, lit. 'the Reliable'), was the seventh Abbasid caliph, who reigned from 813 until his death in 833. His leadership was marked by the power and prosperity of the Abbasid Caliphate, al-Ma'mun promoted the Graeco-Arabic translation movement, the flowering of learning and the sciences in Baghdad, and the publishing of al-Khwarizmi's book now known as "Algebra", making him one of the most important caliphs in the Islamic Golden Age. He is also known as a proponent of the rational Islamic theology of Mu'tazilism.

Al-Ma'mun succeeded his half-brother al-Amin after a civil war, much of his reign was spent on peace campaigns. His strong support for Mu'tazilism led him to imprison a Sunni Imam, Ahmad ibn Hanbal in an event that became known as mihna. Al-Ma'mun's foreign policy was due to his decision to continue war and diplomatic relations with the Byzantine Empire, the tension between conflict or diplomacy varying during his military campaigns.

Abu al-Hasan al-Ash'ari (Arabic: أَبُو ٱلْحَسَن ٱلْأَشْعَرِيّ, romanized: Abū al-Ḥasan al-Ashʿarī; 874–936 CE) was an Arab Muslim theologian known for being the eponymous founder of the Ash'ari school of kalam in Sunnism.

Al-Ash'ari was notable for taking an intermediary position between the two diametrically opposed schools of Islamic theology prevalent at the time: Atharism and Mu'tazilism. He primarily opposed the Mu'tazili theologians on God's eternal attributes and Quranic createdness. On the other hand, the Hanbalis and traditionists were opposed to the use of philosophy or speculative theology, and condemned any theological debate altogether.

Wasil ibn Ata (699–748), also known as al-Ghazzal, was a Muslim theologian and jurist. He is considered to be the founder of the Mu'tazilite school of Aqidah and Kalam.

Abū Isḥāq Muḥammad ibn Hārūn al-Rashīd (Arabic: أبو إسحاق محمد بن هارون الرشيد; October 796 – 5 January 842), better known by his regnal name al-Muʿtaṣim biʾllāh (المعتصم بالله, lit. 'He who seeks refuge in God'), was the eighth Abbasid caliph, ruling from 833 until his death in 842. When al-Ma'mun died unexpectedly on campaign in August 833, al-Mu'tasim was thus well placed to succeed him, with the support of the powerful chief qādī, Ahmad ibn Abi Duwad, he continued to implement the rationalist Islamic doctrine of Mu'tazilism and implementing miḥna policy.

A younger son of Caliph Harun al-Rashid (r. 786–809), he rose to prominence through his formation of a private army composed predominantly of Turkic slave-soldiers (ghilmān, sing. ghulām). This proved useful to his half-brother, Caliph al-Ma'mun, who employed al-Mu'tasim and his Turkish guard to counterbalance other powerful interest groups in the state, as well as employing them in campaigns against rebels and the Byzantine Empire.

The Mihna (Arabic: محنة خلق القرآن, romanized: miḥna khalq al-qurʾān, lit. 'ordeal of Quranic createdness') was a period of religious persecution instituted by the Abbasid caliph al-Ma'mun in 833 in which Sunni scholars were punished, imprisoned, or even killed unless they conformed to Mu'tazilite doctrine. The policy lasted for eighteen years (833–851) as it continued through the reigns of al-Ma'mun's immediate successors, al-Mu'tasim and al-Wathiq, and four years of al-Mutawakkil who reversed it in 851.

The abolition of Mihna is significant both as the end of the Abbasid Caliph's pretension to decide matters of religious orthodoxy, and as one of the few instances of religious persecution among fellow Muslims in Medieval Islam.

Abu 'Abd Allah Muhammad ibn Muhammad ibn al-Nu'man ibn 'Abd al-Salam al-'Ukbari al-Baghdadi (Arabic: أَبُو عَبْدِ ٱللّٰهِ مُحَمَّدُ بْنُ مُحَمَّدٍ بْنِ ٱلنُّعْمَانِ بْنِ عَبْدِ ٱلسَّلَامِ ٱلْحَارِثِيُّ ٱلْعُكْبَرِيُّ ٱلْبَغْدَادِيُّ), known as al-Shaykh al-Mufid (Arabic: الشیخ المفید) and Ibn al-Mu'allim (c. 948–1022 CE), was a prominent Twelver Shia Muslim scholar, jurist (faqīh) and theologian of Iraqi descent. His father was a teacher (mu'allim), hence his nickname Ibn al-Mu'allim ("son of the teacher"). The title "al-Mufid" ("the beneficient [one]") was given to him either by Muhammad al-Mahdi, the twelfth Shia Imam, or by al-Rummani, a Mu'tazilite scholar, after a discussion with him. The leader of the Shia community at his time, he was a staunch mutakallim, theologian, and jurist.

He studied and was taught by the prominent Shia scholars al-Shaykh al-Saduq amd Ibn Qulawayh, as well as Mutazilite scholars Abu al-Husayn al-Basri and al-Rummani. His students included Sharif al-Murtaza and Shaykh Tusi, both of whom became important scholars in their own right. Only 10 of his 200 works have survived, among which are Amali, Al-Irshad, Al-Muqni'ah, and Tashih al-Itiqadat.