11th century. The focus of dominance shifted to the Krishna River – Godavari River doab called Vengi. The former feudatories of the Rashtrakutas in western Deccan were brought under control of the Chalukyas, and the hitherto-suppressed Cholas of Tanjore became their arch enemies in the south. In conclusion, the rise of Rashtrakutas of Manyakheta had a great impact on India, even on India's north. Sulaiman (851), Al-Masudi (944) and Ibn Khurdadba (912) wrote that their empire was the largest in contemporary India and Sulaiman further called it one among the four great contemporary empires of the world. According to the travelogues of the Arabs Al Masudi and Ibn Khordidbih of the 10th century, "most of the kings of Hindustan turned their faces towards the Rashtrakuta king while they were praying, and they prostrated themselves before his ambassadors. The Rashtrakuta king was known as the "King of kings" (Rajadhiraja) who possessed the mightiest of armies and whose domains extended from Konkan to Sind." Some historians have called these times an "Age of Imperial Kannauj". Since the Rashtrakutas successfully captured Kannauj, levied tribute on its rulers and presented themselves as masters of North India, the era could also be called the "Age of Imperial Karnataka". During their political expansion into central and northern India in the 8th to the 10th centuries, the Rashtrakutas or their relatives created several kingdoms that either ruled during the reign of the parent empire or continued to rule for centuries after its fall or came to power much later. Well known among these were the Rashtrakutas of Gujarat (757–888), the Rattas of Saundatti (875–1230) in modern Karnataka, the Gahadavalas of Kannauj (1068–1223), the Rashtrakutas of Rajasthan (known as Rajputana) and ruling from Hastikundi or Hathundi (893–996), Dahal (near Jabalpur), Rathores of Mandore (near Jodhpur), the Rathores of Dhanop, Rashtraudha dynasty of Mayuragiri in modern Maharashtra and Rashtrakutas of Kannauj. Rajadhiraja Chola's conquest of the island of Ceylon in the early 11th century CE led to the fall of four kings there. According to historian K. Pillay, one of them, King Madavarajah of the Jaffna kingdom, was an usurper from the Rashtrakuta Dynasty. Administration Inscriptions and other literary records indicate the Rashtrakutas selected the crown prince based on heredity. The crown did not always pass on to the eldest son. Abilities were considered more important than age and chronology of birth, as exemplified by the crowning of Govinda