Why was the chola period from 1000 to 1200 ad referred to as the period of imperial cholas'?
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Answer..........
The Chola dynasty was one of the longest-ruling dynasties in history. The earliest datable references to this Tamil dynasty[2][3][4] are in inscriptions from the 3rd century BCE left by Ashoka, of the Maurya Empire (Ashoka Major Rock Edict No.13). As one of the Three Crowned Kings of Tamilakam, the dynasty continued to govern over varying territory until the 13th century CE.
Chola Dynasty
300s BCE–1279 CE

Note: The flag is designed without reference for illustrating the Chola Flag

Map showing the extent of the Chola empire c. 1030
CapitalEarly Cholas: Poompuhar, Urayur, Tiruvarur,
Medieval Cholas: Pazhaiyaarai, Thanjavur
Gangaikonda CholapuramOfficial languagesTamil, Sanskrit[1]Religion
Hinduism (predominantly Shaivism)GovernmentMonarchyKing and Emperor
• 848–871
Vijayalaya Chola (first)
• 1246–1279
Rajendra Chola III (last)Historical eraMiddle Ages
• Established
300s BCE
• Rise of the medieval Cholas
848 CE
• Empire at its greatest extent
1030 CE
• Disestablished
1279 CE
Succeeded byPandyan dynasty
The heartland of the Cholas was the fertile valley of the Kaveri River, but they ruled a significantly larger area at the height of their power from the later half of the 9th century till the beginning of the 13th century. The whole country south of the Tungabhadra was united and held as one state for a period of three centuries and more between 907-1215 AD.[5] Under Rajaraja Chola I and his successors Rajendra Chola I, Rajadhiraja Chola, Virarajendra Chola and Kulothunga Chola I the dynasty became a military, economic and cultural power in South Asia and South-East Asia.[6]The power of the new empire was proclaimed to the eastern world by the expedition to the Ganges which Rajendra Chola I undertook and by the naval raids on cities of the maritime empire of Srivijaya, as well as by the repeated embassies to China.[7] The Chola fleet represented the zenith of ancient Indian sea power.
During the period 1010–1153, the Chola territories stretched from the islands of the Maldives in the south to as far north as the banks of the Godavari River in Andhra Pradesh.[8] Rajaraja Chola conquered peninsular South India, annexed parts of which is now Sri Lanka and occupied the islands of the Maldives. Rajendra Chola sent a victorious expedition to North India that touched the river Ganges and defeated the Pala ruler of Pataliputra, Mahipala. He also successfully invaded cities of Srivijaya of Malaysia and Indonesia.[9] The Chola dynasty went into decline at the beginning of the 13th century with the rise of the Pandyan dynasty, which ultimately caused their downfall.[10][11]
The Cholas left a lasting legacy. Their patronage of Tamil literature and their zeal in the building of temples has resulted in some great works of Tamil literature and architecture.[6] The Chola kings were avid builders and envisioned the temples in their kingdoms not only as places of worship but also as centres of economic activity.[12][13] They pioneered a centralised form of government and established a disciplined bureaucracy. The Chola school of art spread to Southeast Asia and influenced the architecture and art of Southeast Asia
it is called the period of imperial cholas because in this period great chola Kings like Rajaraja chola , Rajendra Chola , Vijayala ruled .