Zabulistan occupied a stretch of eastern Afghanistan centered roughly between modern Ghazni and Kandahar, a region where the Hindu Kush gives way to arid plateau. The Zunbils were related to the Turk Shahis who controlled Kabul and Gandhara to the east, and together these dynasties formed a buffer zone between the expanding Islamic caliphate and the Indian subcontinent. Their origins remain debated: some scholars trace them to Hephthalite or Turkic roots, while others emphasize indigenous Afghan lineages. What is clear is that the Zunbils governed a religiously diverse territory where Buddhism, Hinduism, and an enigmatic deity called Zun coexisted in ways that defy easy categorization. The Chinese pilgrim Xuanzang, traveling through the region in the early 700s, reported numerous Buddhist stupas alongside dozens of Hindu temples.

At the center of Zunbil religious life stood the temple of Zun, an Indo-Iranian deity whose identity scholars still debate. On coins, the god appears with flames radiating from his head. Statues in the temple were adorned with gold, and rubies served as eyes. Xuanzang called the deity "sunagir," and some researchers have connected Zun to the Hindu god Shiva, noting parallels in iconography and worship. Others have proposed a link to the Zoroastrian deity Zurvan, the god of time, suggesting a syncretism between pre-Islamic Iranian religion and the Buddhism that permeated the region. The Tapa Sardar Buddhist monastery near Ghazni, dating partly to the Zunbil era, shows how these traditions wove together: Buddhist sculpture influenced by Gandharan, Indian, and Central Asian styles, all created under rulers whose own religious identity resisted neat labels.

The Arab conquest of Persia in the mid-7th century brought Muslim armies to the borders of Zabulistan, but turning raids into permanent control proved impossible. For decades, the governors of Sistan, the lowland province to the west, launched plundering expeditions into Zunbil territory. Most accomplished nothing lasting. In 769 CE, an Arab general named Ma'n ibn Za'ida finally extracted tribute near Ghazni, the first the caliphate had obtained in nearly half a century. When the Abbasid Caliph al-Mahdi demanded submission in the 770s, the Zunbils apparently agreed on paper, but the submission was nominal. The people of the region continued to resist Muslim rule. Even when the Abbasid Caliph al-Ma'mun crushed the related Turk Shahis of Kabul in 815 CE, forcing them to convert to Islam and surrender territory, the Zunbils remained untouched, continuing to govern for another half century.

The man who finally ended Zunbil independence was Yaqub ibn Laith al-Saffar, the "coppersmith" turned warlord who founded the Saffarid dynasty from his base in Sistan. In 870 CE, Yaqub's forces swept through the entire Zunbil domain, accomplishing what the historian C.E. Bosworth called the first permanent Muslim expansion into eastern Afghanistan after more than two centuries of failed attempts. The conquest was decisive. But the broader resistance did not end: the Hindu Shahis, who had taken over in Gandhara and Kabul after the fall of the Turk Shahis in 822 CE, continued to fight the eastern advance of Islam until approximately 1026 CE, when Mahmud of Ghazni finally broke them. The Zunbils were one chapter in a much longer story of resistance along the Hindu Kush frontier.

Today, the physical traces of the Zunbil kingdom are fragmentary but haunting. The Buddhist monastery at Tapa Sardar near Ghazni, partially excavated by Italian archaeologists, yielded sculpture that bridges Gandharan and Central Asian styles. Coins bearing the flame-crowned image of Zun surface in collections and catalogues, small metal discs that outlasted the temples they once funded. The landscape itself has changed less than one might expect: eastern Afghanistan remains arid, mountainous, and contested, a corridor between Central Asia and the Indian subcontinent that empires have fought over for millennia. The Zunbils held this ground for over two hundred years against the most powerful military force of their era. That they are barely remembered outside specialist scholarship says more about who writes history than about the scale of what they achieved.