Please forgive the double posting, but while compiling this post for the Iranian in EU III thread, I realized there's also much useful information about the Ottomans, Turks and Anatolia to be ignored here.
KIZILBASH:
Kizilbash (Turkish: Kızılbaş) - "Red Heads" - name given to a wide variety of extremist Shi'ite militant groups (ghulāt) who helped found the Safavid Dynasty of Iran. The name "Red Heads" is derived from their distinct headwear with twelve points indicating their adherence to the twelve Imams.
The origin of the "Kizilbash movement" - as they were called by their Sunni Ottoman foes and later adopted the name as a mark of pride - can be dated from middle of the 15th century, when their spiritual grandmaster (shaykh) Haydar, the head of the Safawiyya Sufi order, organized his followers into a body of militant troops.
The Kizilbash were a coalition of many different peoples of predominantly, but not exclusively Turkic-speaking background, united in their belief in the Safavid doctrine of Shiism.
Kizilbash Belief System:
Kizilbash tribes adhered to heterodox Shi'a doctrines encouraged by early Safawiyyah sheikhs, specifically sheikh Haydar and his son, Ismail. They regarded their rulers as divine figures, and would thus be classified as ghulat extremist by orthodox Twelver Shia. It is clear that Ismail I. was presenting himself to his Kizilbash followers not as a representative of the Hidden Imam, but as the Hidden Imam himself, beyond that even claiming divinity for himself. The Kizilbash would go into battle without armour, confident that no harm would befall them.
This stemmed from the fact that among the Kizilbash there appeared to be a substantial lack of knowledge of Twelver Shia doctrines. When Tabriz was taken for example, there was not a single book on Twelver Shiism among Kizilbash leaders, and the book of the well known Allama Al-Hilli was procured in the town library to provide guidance on new religion of the state. Nor did any Shia ulema participate in the formation of Safavid religious policies during the early stages of the state. However later, the ghulat doctrines were forsaken and Arab Twelver Shia ulema resident in Iraq and Bahrain were brought in increasing numbers. Initially the Shia ulema kept quiet about inconsistencies in the religious stance of the monarch, but during the following century they were able to enforce a stricter version of Shia Islam on the population and the state.
Turks and Tadjik (Iranians):
Among the Kizilbash, Turkish tribes from Eastern Anatolia and Azerbaijan who had helped Shah Ismail I defeat the Akkoyunlu tribe were by far the most important - in number and influence. Some of these greater Turkish tribes (oymaq) were subdivided into as many as eight or nine clans and included the:
Ustādjlu
Rumlu (from Sivas region)
Shāmlu (from Damascus region)(the most powerful clan during the reign of Shah Ismail I.)
Dulkadir (from Malatya region)
Afshār (from Khorasan region)
Qājār (from Tebriz region)
Tekeli (from Teke region)
Other tribes, such as Turkman, Bahārlu (from Fars and Kerman regions), Warsāk, or Bayāt were occasionally listed among these "seven great oymaqs".
[Some of these names consist of a place-name with addition of the Turkish suffix -lu, such as Shāmlu or Bahārlu. Other names are those of old Oghuz tribes such as Afshār, Dulkadir, or Bayāt ; as mentioned by the medival Uyghur historian Mahmoud Al-Kāshgharī.]
The non-Turkic or non-Turkish-speaking Iranian tribes among the Kizilbash were called Tājiks (meaning "Non-Turks" or "Iranians") by the Turks and included[6][7]:
Tālish
Siāh-Kuh (Karādja-Dagh)
Lur tribes (for example the Zand)
certain Kurdish tribes
certain Persian families and clans
The rivalry between the Turkic clans and Persian nobles was a major problem in the Safavid kingdom and caused much trouble. As V. Minorsky put it, friction between these two groups was inevitable, because the Turks "were no party to the national Persian tradition". Shah Ismail tried to solve the problem by appointing Persian wakils as commanders of Kizilbash tribes. However, the Turks considered this an insult and brought about the death of 3 of the 5 Persians appointed to this office - an act, that later lead to the deprivation of the Turks by Shah Abbas I.
The Beginnings:
In the 15th century, Ardabil was the center of an organization designed to keep the Safavid leadership in close touch with its murids in Azerbaijan, Iraq, eastern Anatolia, and elsewhere. The organization was controlled through the office of
khalīfāt al-khulafā'ī who appointed representatives (khalīfa) in regions where Safavid propaganda was active. The khalīfa, in turn, had subordinates termed pira. Their presence in eastern Anatolia posed a serious threat to the Ottomans, because they encouraged the Shi'ite population of Asia Minor to revolt against the sultan.
In 1499, Ismail, the young leader of the Safavid order, left Lanjan for Ardabil to make his bid for power. By the summer of 1500, ca. 7,000 supporters from the local Turkish tribes of Anatolia, Syria, and Iraq - collectively called "Kizilbash" - rallied to his support. Leading his troops on a punitive campaign against the Shīrvanshāh (ruler of Shirvan), he sought revenge for the death of his father and his grand-father in Shīrvan. After defeating the Shīrvanshāh Farrukh Yassar, he moved south into Azarbaijan where his 7,000 Kizilbash warriors defeated a force of 30,000 Ak Koyunlu under Alwand Mirzā, and conquered Tabriz. This was the beginning of the Safavid state.
In the first decade of the 16th century, the Kizilbash expanded Safavid rule over the rest of Persia, as well as Baghdad and Iraq, formerly under Ak Koyunlu control.
In 1510 Shah Ismail sent a large force of the Kizilbash to Transoxania to support the Timurid ruler Babur in his war against the Uzbeks. The Kizilbash defeated the Uzbeks and secured Samarqand for Babur. However, in 1512, an entire Kizilbash army was annihilated by the Uzbeks after Turkish Kizilbash had mutinied against their Persian wakil and commander, Amir Nadjm. This heavy defeat put an end to Safavid expansion and influence in Transoxania and the northeastern frontiers of the kingdom remained vulnerable to nomad invasions.
The Battle of Chaldiran:
Meanwhile, the Safavid da'wa (propaganda) continued in Ottoman areas - with great success. Even more alarming for the Ottomans was the successful conversion of Turkish tribes in eastern Anatolia and Iraq, and the recruitment of these well experienced and feared fighters into the growing Safavid army. In order to stop the Safavid propaganda, Sultan Bayezid II deported large numbers of the Shi'ite population of Asia Minor to Morea. However, in 1507, Shah Ismail and the Kizilbash overran large areas of Kurdistan, defeating regional Ottoman forces. Only two years later in Central Asia, the Kizilbash defeated the Uzbeks at Merv, killing their leader Muhammad Shaybani and destroying his dynasty. His head was sent to the Ottoman sultan as a warning.
In 1511, a Shi'ite revolt broke out in Teke (southwest Anatolia) and was brutally suppressed by the Ottomans: 40,000 were massacred on the order of the sultan. Shah Ismail sought to turn the chaos within the Ottoman Empire to his advantage and invaded Anatolia. The Kizilbash defeated a large Ottoman army under Sinan Pasha. Shocked by this heavy defeat, Sultan Selim I (the new ruler of the Empire) decided to invade Persia with a force of 200,000 Ottomans and face the Kizilbash on their own soil. In addition, he ordered the persecution of Shiism and the massacre of all its adherents in the Ottoman Empire.
On the 20th August of 1514, the two armies met at Chaldiran in Azarbaijan. The Ottomans outnumbered the Kizilbash two to one and had artillery and handguns. The Kizilbash were heavily defeated, and many high-ranking Kizilbash amirs as well as three influential figures of the ulamā were killed.
The defeat destroyed Shah Ismail's belief in his invincibility and his
divine status.
The outcome at Chaldiran had many consequences. Perhaps most significantly, it established the border between the two empires, which remains the border between Turkey and Iran today. With the establishment of that border, Tabriz became a frontier city, uncomfortably close to the Ottoman enemy. That consideration would be a major factor in the decision to move the Safavid capital to Qazvin, in the mid-16th century, and finally to Isfahan, in central Persia, in 1598.
The Safavids made drastic domestic changes after the defeat at Chaldiran. The Safavids spoke Turkish language but, following the loss of their Anatolian territories which formed the heartland of their Turkish support switched to Persian. The Safavid royal family also moved away from extreme, eschatological, Alevi sect and adopted Shia sect as the official religion of the empire - the position of the Shah as Mahdi being incompatible with the recent defeat . The Sunni majority of Iran was also forcibly converted to Shia while those, mostly kizilbash, who refused to abandon the previous worship of the Shah were executed.
The deprivation of the Turks and "Persianization" of the Kizilbash movement:
Inter-tribal rivalry of the Turks, the attempt of Persian nobles to the end the Turkish dominance, and constant succession conflicts went on for another 10 years after Tahmasp's death. This heavily weakened the Safavid state and made the kingdom vulnerable to external enemies: the Ottomans attacked and conquered Azerbaijan, the Uzbeks conquered Khorasan, including Balkh and Herat.
In 1588, Shah Abbas I came to power. Events of the past, including the role of the Turks in the succession struggles after the death of his father, made him determined to end the dominance of the untrustworthy Turkish chiefs in Persia. In order to weaken the Turks - the important militant elite of the Safavid kingdom - Shah Abbas raised a standing army from the ranks of the ghulams who were usually ethnic Armenians and Georgians. The new army would be loyal to the king personally and not to clan-chiefs anymore.
The reorganisation of the army also ended the independent rule of Turkish chiefs in the Safavid provinces, and instead centralized the administration of those provinces.
Ghulams were appointed to high positions within the royal household, and by the end of Shah Abbas' reign, "one-fifth of the high-ranking amirs were ghulams". By 1598 an ethnic Armenian from Georgia had risen to the position of commander-in-chief of all Safawid armed forces. The offices of wakil and amir al-umarā fell in disuse and were replaced by the office of a Sipahsālār (master of the army), commander-in-chief of all armed forces - Turkish and Non-Turkish - and usually held by a Persian noble.
This was a heavy victory of the Tādjik fraction over the Turks and meant the end of decades of Turkish domination in Persia.
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gathered from Wikipedia and other sources