The Greatest Dynasty of South Asia in 9th and 10th century

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The Rashtrakuta Dynasty was established in the 8th century by Dantidurga who also defeated the Arab invaders when he was a general of the Chalukya Dynasty. The Rashtrakuta Dynasty became the major power of South Asia in the 9th and 10th century. The Arab scholars like Sulaiman and Masudi who visited South Asia during this period were very impressed by the military power, wealth and religious tolerance of the Rashtrakuta Dynasty and described it as one of the 4 great Empires of the World. The Arabs also called the Rashtrakuta Kings the greatest Kings of Hind. According to the testimony of the Arab scholars, the followers of Islam who had settled down as traders in several ports of western and southern India of the Rashtrakuta Dynasty were allowed to build mosques and to practice their religion without hindrance. Sulaiman wrote that "the Rashtrakuta Dynasty was one of the 4 great Empires of the world."
Masudi says in the 10th century: "The most powerful king in al-Hind of our time is the Rashtrakuta, king of the city of Mankir, the greatest centre of the country. And Masudi states" The Rashtrakuta king has innumerable armies and he has elephants. He has a large kingdom, and his country has vast stretches of cultivated lands, abundant commerce and plentiful resources. He receives large amounts of revenues, and his wealth
is enormous."
The Arab Scholars like Sulaiman, Masudi Ibn-Hakul and Abu-Zaid mention "the Rashtrakuta king as the greatest of the kings of Al-Hind. Their domain extends from the coast of Konkan up to Sindh. The Rashtrakuta king is the most noble king of al-Hind, and all acknowledge his nobility."

Reference: India: A History by John Keay
Al-Hind the Making of the Indo-Islamic World: Early Medieval India and the expansion of Islam 7th-11th centuries by André Wink
A Comprehensive History Of Ancient India