Indo-Scythians (also called Indo-Sakas) were a group of nomadic Iranian peoples of Scythian origin who migrated from Central Asia southward into modern day Afghanistan, Pakistan and Northwestern India from the middle of the 2nd century BCE to the 4th century CE. The first Saka king of India was Maues/Moga (1st century BCE) who established Saka power in Gandhara, Afghanistan, Pakistan, India and the Indus Valley. The Indo-Scythians extended their supremacy over north-western India, conquering the Indo-Greeks and other local kingdoms. The Indo-Scythians were apparently subjugated by the Kushan Empire, by either Kujula Kadphises or Kanishka. Yet the Saka continued to govern as satrapies, forming the Northern Satraps and Western Satraps. The power of the Saka rulers started to decline in the 2nd century CE after the Indo-Scythians were defeated by the Satavahana emperor Gautamiputra Satakarni. Indo-Scythian rule in the northwestern Indian subcontinent ceased when the last Western Satrap Rudrasimha III was defeated by the Gupta emperor Chandragupta II in 395 CE. The invasion of northern regions of the Indian subcontinent by Scythian tribes from Central Asia, often referred to as the Indo-Scythian invasion, played a significant part in the history of the Indian subcontinent as well as of nearby countries. In fact, the Indo-Scythian war is just one chapter in the events triggered by the nomadic flight of Central Asians from conflict with tribes such as the Xiongnu in the 2nd century CE, which had lasting effects on Bactria, Kabul, and the Indian subcontinent as well as far-off Rome in the west, and more nearby to the west in Parthia. Ancient Roman historians, including Arrian and Claudius Ptolemy, have mentioned that the ancient Sakas ("Sakai") were nomadic people. The first rulers of the Indo-Scythian Kingdom were Maues, c. 85–60 BCE, and Vonones, c. 75–65 BCE. Origins The ancestors of the Indo-Scythians are thought to have been Sakas (Scythian) tribes. "One group of Indo-European speakers that makes an early appearance on the Xinjiang stage is the Saka (Ch. Sai). Saka is more a generic term than a name for a specific state or ethnic group; Saka tribes were part of a cultural continuum of early nomads across Siberia and the Central Eurasian steppe lands from Xinjiang to the Black Sea. Like the Scythians whom Herodotus describes in book four of his History (Saka is an Iranian word equivalent to the Greek Scythes, and many scholars refer to them together as Saka-Scythian),