Rashidun Caliphate

The Rashidun Caliphate (al-Khilāfah ar-Rāšidah; 632 661) was the first caliphate to succeed the Islamic prophet Muhammad. It was ruled by the first four successive caliphs of Muhammad after his death in 632 CE (11 AH). During its existence, the empire was the most powerful economic, cultural, and military force in West Asia. The caliphate arose following Muhammad’s passing in June 632 and the subsequent debate over the succession to his leadership. Muhammad's close companion Abu Bakr (632-634), of the Banu Taym clan, was elected the first caliph in Medina and he began the conquest of the Arabian Peninsula. His brief reign ended in August 634 when he died and was succeeded by Umar (634-644), his appointed successor from the Banu Adi clan. Under Umar, the caliphate expanded at an unprecedented rate, ruling more than two-thirds of the Byzantine Empire and nearly the entire Sasanian Empire. Umar was assassinated in November 644 and was succeeded by Uthman (644-656), a member of the Banu Umayya clan, who was elected by a six-person committee arranged by Umar. Under Uthman, the caliphate concluded its conquest of Persia in 651 and continued expeditions into the Byzantine territories. Uthman's nepotistic policies earned him vehement opposition from some Muslim generals and he was eventually assassinated by rebels in June 656. He was subsequently succeeded by Ali (656-661), a member of Muhammad's Banu Hashim clan, who transferred the capital to Kufa. Ali presided over the civil war called the First Fitna as his suzerainty was unrecognized by Uthman's kinsman and Syria's governor Mu'awiya I (661-680), who believed that Uthman was unlawfully killed and his murderers should be punished. Additionally, a third faction known as Kharijites, who were former supporters of Ali, rebelled against both Ali and Mu'awiya after refusing to accept the arbitration in the Battle of Siffin. The war led to the overthrow of the Rashidun Caliphate and the establishment of the Umayyad Caliphate in 661 by Mu'awiya.

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Musaylima

Musayliama the Liar (مُسَيْلِمَةُ), otherwise known as Maslama ibn Ḥabīb (مَسْلَمَةُ بْنُ حَبِيبٍ) d.632, was a claimant of prophethood from the Banu Hanifa tribe, of which present day descendants include the House of Saud among other Najd tribes. Based from Diriyah in present day Riyadh, Saudi Arabia, he claimed to be a prophet and was an opponent of Islam in 7th-century Arabia. He was a leader during the Ridda wars. He is considered by Muslims to be a false prophet (اَلْكَذَّابُ al-Kadhāb).

Taif

Taif (, atʕˈ tʕaːjɪf) is a city and governorate in the Makkah Region of Saudi Arabia. Located at an elevation of in the slopes of the Hijaz Mountains, which themselves are part of the Sarat Mountains, the city has a 2020 estimated population of 688,693 people, making it the 6th most populous city in the kingdom. There is a belief that Taif is indirectly referred to in Quran 43:31. The city was visited by the Islamic prophet Muhammad, sometime in the early 7th century, and was inhabited by the tribe of Banu Thaqif.

Aisha

Aisha (; ˈɑːiːʃɑː, also US-ʃə,_aɪˈiːʃə, UKɑːˈ(j)iːʃə; 613/614 – July 678) was Islamic prophet Muhammad's third and youngest wife. In Islamic writings, her name is thus often prefixed by the title "Mother of the Believers" (ʾumm al-muʾminīn), referring to the description of Muhammad's wives in the Qur'an. Little is known about the early life of Aisha. A preponderance of classical sources converge on Aisha being 6 or 7 years old at the time of her marriage, and 9 at the consummation; her age has become a source of ideological friction in modern times.

As easy as ABC: Optimal (A)ccountable (B)yzantine (C)onsensus is easy!

Rachid Guerraoui, Jovan Komatovic, Pierre Philippe Civit, Vincent Gramoli, Seth Gilbert

It is known that the agreement property of the Byzantine consensus problem among n processes can be violated in a non-synchronous system if the number of faulty processes exceeds t0 = ┌n/3┐ − 1 [10], [19]. In this paper, we investigate the accountable Byza ...

IEEE2022

Consensus protocols for asynchronous networks are usually complex and inefficient, leading practical systems to rely on synchronous protocols. This paper attempts to simplify asynchronous consensus by building atop a novel threshold logical clock abstracti ...

2019