Zaidiyyah in the context of "Isma'ilism"

A madhhab (Arabic: مَذْهَب, romanized: madhhab, lit. 'way to act', IPA: [ˈmaðhab], pl. مَذَاهِب, madhāhib, [ˈmaðaːhib]) refers to any school of thought within Islamic jurisprudence. The major Sunni madhhab are Hanafi, Maliki, Shafi'i and Hanbali. They emerged in the ninth and tenth centuries CE and by the twelfth century almost all Islamic jurists aligned themselves with a particular madhhab. These four schools recognize each other's validity and they have interacted in legal debate over the centuries. Rulings of these schools are followed across the Muslim world without exclusive regional restrictions, but they each came to dominate in different parts of the world. For example, the Maliki school is predominant in North and West Africa; the Hanafi school in South and Central Asia; the Shafi'i school in East Africa and Southeast Asia; and the Hanbali school in North and Central Arabia. The first centuries of Islam also witnessed a number of short-lived Sunni madhhabs. The Zahiri school, which is considered to be endangered, continues to exert influence over legal thought. The development of Shia legal schools occurred along the lines of theological differences and resulted in the formation of the Ja'fari madhhab amongst Twelver Shias, as well as the Isma'ili and Zaydi madhhabs amongst Isma'ilis and Zaydis respectively, whose differences from Sunni legal schools are roughly of the same order as the differences among Sunni schools. The Ibadi legal school, distinct from Sunni and Shia madhhabs, is predominant in Oman. Unlike Sunnis, Shias, and Ibadis, non-denominational Muslims are not affiliated with any madhhab.

The transformations of Islamic legal institutions in the modern era have had profound implications for the madhhab system. With the spread of codified state laws in the Muslim world, the influence of the madhhabs beyond personal ritual practice depends on the status accorded to them within the national legal system. State law codification commonly drew on rulings from multiple madhhabs, and legal professionals trained in modern law schools have largely replaced traditional ulama as interpreters of the resulting laws. In the 20th century, some jurists began to assert their intellectual independence from traditional madhhabs. With the spread of Salafi influence and reformist currents in the 20th century; a handful of Salafi scholars have asserted independence from being strictly bound by the traditional legal mechanisms of the four schools. Nevertheless, the majority of Sunni scholarship continues to uphold post-classical creedal belief in rigorously adhering (Taqlid) to one of the four schools in all legal details.

The Sulayhid dynasty (Arabic: بَنُو صُلَيْح, romanized: Banū Ṣulayḥ, lit. 'Children of Sulayh') was an Ismaili Shi'ite Arab dynasty established in 1047 by Ali ibn Muhammad al-Sulayhi that ruled most of historical Yemen at its peak. The Sulayhids brought to Yemen peace and a prosperity unknown since Himyaritic times. The regime was confederate with the Cairo-based Fatimid Caliphate, and was a constant enemy of the Rassids - the Zaidi Shi'ite rulers of Yemen throughout its existence. The dynasty ended with Arwa al-Sulayhi affiliating to the Taiyabi Ismaili sect, as opposed to the Hafizi Ismaili sect that the other Ismaili dynasties such as the Zurayids and the Hamdanids adhered to.

The Daylamites or Dailamites (Middle Persian: Daylamīgān; Persian: دیلمیان Deylamiyān) were an Iranian people inhabiting the Daylam—the mountainous regions of northern Iran on the southwest coast of the Caspian Sea, now comprising the southeastern half of Gilan Province.

The Daylamites were a warlike people skilled in close combat. They were employed as soldiers by the Sasanian Empire and by the subsequent Muslim empires. Daylam and Gilan were the only regions to successfully resist the Muslim conquest of Persia, although many Daylamite soldiers outside Daylam accepted Islam. In the 9th century many Daylamites adopted Zaidi Islam. In the 10th century some adopted Isma'ilism, then in the 11th century Fatimid Isma'ilism and subsequently Nizari Isma'ilism. Both the Zaidis and the Nizaris maintained a strong presence in Iran up until the 16th century rise of the Safavids who espoused the Twelver sect of Shia Islam. In the 930s, the Daylamite Buyid dynasty emerged and managed to gain control over much of modern-day Iran, which it held until the coming of the Seljuk Turks in the mid-11th century.

Shi‘a Islam, also known as Shi‘ite Islam or Shia, is the second largest branch of Islam after Sunni Islam. Shias adhere to the teachings of Muhammad and the religious guidance of his family (who are referred to as the Ahl al-Bayt) or his descendants known as Shia Imams. Muhammad's bloodline continues only through his daughter Fatima Zahra and cousin Ali who alongside Muhammad's grandsons comprise the Ahl al-Bayt. Thus, Shias consider Muhammad's descendants as the true source of guidance along with the teaching of Muhammad. Shia Islam, like Sunni Islam, has at times been divided into many branches; however, only three of these currently have a significant number of followers, and each of them has a separate trajectory.

From a political viewpoint the history of the Shia was in several stages. The first part was the emergence of the Shia, which starts after Muhammad's death in 632 and lasts until Battle of Karbala in 680. This part coincides with the Imamah of Ali, Hasan ibn Ali and Hussain. The second part is the differentiation and distinction of the Shia as a separate sect within the Muslim community, and the opposition of the Sunni caliphs. This part starts after the Battle of Karbala and lasts until the formation of the Shia states about 900. During this section Shi'ism divided into several branches. The third section is the period of Shia states. The first Shia state was the Idrisid dynasty (780–974) in Maghreb. Next was the Alavid dynasty (864–928) established in Mazandaran (Tabaristan), north of Iran. These dynasties were local, but they were followed by two great and powerful dynasties. The Fatimid Dynasty formed in Ifriqiya in 909, and ruled over varying areas of the Maghreb, Egypt and the Levant until 1171. The Buyid dynasty emerged in Daylaman, in the north of present-day Iran, in about 930 CE and then ruled over central and western parts of Iran and Iraq until 1048. As a result, the period from the mid-10th to the mid-11th century is often known as the "Shi'a Century" of Islam. In Yemen, Imams of various dynasties usually of the Zaidi sect established a theocratic political structure that survived from 897 until 1962. Iran, formerly of Sunni majority region underwent a process of forced conversion to Shia Islam under the Saffavids between the 16th and 18th century. The process also ensured the dominance of the Twelver sect within Shiism over the Zaidiyyah and sects of Isma'ilism in the modern day.

Al-Mansur al-Qasim (November 13, 1559 – February 19, 1620), with the cognomen al-Kabir (the Great), was an Imam of Yemen, who commenced the struggle to liberate Yemen from the Ottoman occupiers. He was the founder of a Zaidi kingdom that endured, under many vicissitudes, until 1970.

The Houthi insurgency, also known as the Sa'dah Wars, was a military rebellion pitting Zaidi Shia Houthis that began in northern Yemen and has since escalated into a full-scale civil war. The conflict was sparked in 2004 by the government's attempt to arrest Hussein al-Houthi, a Zaidi religious leader of the Houthis and a former parliamentarian on whose head the government had placed a $55,000 bounty.

Initially, most of the fighting took place in Saada Governorate in northwestern Yemen, but some of the fighting spread to neighbouring governorates Hajjah, 'Amran, al-Jawf and the Saudi province of Jizan. After the Houthi takeover of the capital city Sanaa in late 2014, the insurgency became a full-blown civil war with a major Saudi-led intervention in Yemen beginning in March 2015.