Hephthalite in the context of "Xionites"

Kavad I (Middle Persian: 𐭪𐭥𐭠𐭲 Kawād; 473 – 13 September 531) was the Sasanian King of Kings of Iran from 488 to 531, including a two or three-year interruption. A son of Peroz I (r. 459–484), he was crowned by the nobles to replace his deposed and unpopular uncle Balash (r. 484–488).

Inheriting a declining empire where the authority and status of the Sasanian kings had largely weakened, Kavad tried to reorganize his empire by introducing many reforms whose implementation was completed by his son and successor, Khosrow I. They were made possible by Kavad's use of the Mazdakite preacher Mazdak, leading to a social revolution that weakened the authority of the nobility and the clergy. Because of this, and the execution of the powerful king-maker Sukhra, Kavad was deposed and imprisoned in the Castle of Oblivion. He was replaced by his brother Jamasp. However, with the aid of his sister and an officer named Siyawush, Kavad and some of his followers fled east to the territory of the Hephthalite king, who provided him with an army. This enabled Kavad to restore himself to the throne in 498/9.

The Turk Shahis were a dynasty of Western Turk, or mixed Turco-Hephthalite origin, that ruled from Kabul and Kapisa to Gandhara in the 7th to 9th centuries AD. They may have been of Khalaj ethnicity. The Gandhara territory may have been bordering the Kashmir kingdom to the east. From the 560s, the Western Turks had gradually expanded southeasterward from Transoxonia, and occupied Bactria and the Hindu Kush region, forming largely independent polities. The Turk Shahis may have been a political extension of the neighbouring Western Turk Yabghus of Tokharistan. In the Hindu Kush region, they replaced the Nezak Huns – the last dynasty of Bactrian rulers with origins among the Xwn (Xionite) and/or Huna peoples (who are sometimes also referred to as "Huns" who invaded Eastern Europe during a similar period).

The Turk Shahis arose at a time when the Sasanian Empire had already been conquered by the Rashidun Caliphate. The Turk Shahis then resisted for more than 250 years the eastward expansion of the Abbasid Caliphate, until they fell to the Persian Saffarids in the 9th century AD. The Ghaznavids then finally broke through into India after overpowering the declining subsequent Hindu Shahis and Gurjaras.

The Battle of Nahavand (Arabic: معركة نهاوند Maʿrakah Nahāwand, Persian: نبرد نهاوند Nabard-e Nahâvand), also spelled Nihavand or Nahawand, was fought in 642 between the Rashidun Muslim forces under An-Numan ibn Muqarrin and Sasanian army under King Yazdegerd III. Yazdegerd escaped to the Merv area, but was unable to raise another substantial army. The battle ended in a victory for the Rashidun Caliphate and the Sasanids consequently lost the surrounding cities including Spahan (Isfahan). The engagement resulted in a catastrophic defeat for the Sasanid forces and marks the end of organized Sasanid resistance. Thus opening the path for Islamic expansion into Persia and the subsequent religious transformation of the region.

The former Sasanid provinces, in alliance with Parthian and White Hun nobles, resisted for about a century in the region south of the Caspian Sea, even as the Rashidun Caliphate was replaced by the Umayyads, thus perpetuating the Sasanid court styles, Zoroastrian religion, and Persian language.

Hunas or Huna (Middle Brahmi script: Hūṇā) was the name given by the ancient Indians to a group of Central Asian tribes who, via the Khyber Pass, entered the Indian subcontinent at the end of the 5th or early 6th century. The Hunas occupied areas as far south as Eran and Kausambi, greatly weakening the Gupta Empire. The Hunas were ultimately defeated by a coalition of Indian princes that included an Indian king Yasodharman and the Gupta emperor, Narasimhagupta. They defeated a Huna army and their ruler Mihirakula in 528 CE and drove them out of India. The Guptas are thought to have played only a minor role in this campaign.

The Hunas are thought to have included the Xionite and/or Hephthalite, the Kidarites, the Alchon Huns (also known as the Alxon, Alakhana, Walxon etc.) and the Nezak Huns. Such names, along with that of the Harahunas (also known as the Halahunas or Harahuras) mentioned in Hindu texts, have sometimes been used for the Hunas in general; while these groups (and the Iranian Huns) appear to have been a component of the Hunas, such names were not necessarily synonymous. Some authors suggest that the Hunas were Hephthalite Huns from Central Asia. The relationship, of the Hunas to the Huns, a Central Asian people who invaded Europe during the same period, is under research.

Balash (Middle Persian: 𐭥𐭥𐭣𐭠𐭧𐭱𐭩, Wardākhsh/Walākhsh) was the Sasanian King of Kings of Iran from 484 to 488. He was the brother and successor of Peroz I (r. 459–484), who was defeated and killed by the Hephthalites.

The Khalaj (Bactrian: χαλασσ, romanized: Xalass; Persian: خلج‌ها, romanized: Xalajhâ) are a Turkic ethnic group who mainly reside in Iran. In Iran they still speak the Khalaj language, although most of them are Persianized.

Historically, the Khalaj who lived among Pashtuns were slowly Pashtunized. Due to this, the Khaljis of Delhi, originating from Khalaj migrants from Afghanistan into India, were often considered to be Pashtuns by other Turkic nobles. The Ghiljis, one of the largest Pashtun tribes, also derive their name from the Khalaj, and it is likely that the Khalaj initially formed the core of this tribe.