In the late 10th century, the Western Chalukyas, also known as the Kalyani Chalukyas or 'Later' Chalukyas rose to power by overthrowing the Rashtrakutas under whom they had been serving as feudatories. Manyakheta was their capital early on before they moved it to Kalyani (modern Basavakalyan). Whether the kings of this empire belonged to the same family line as their namesakes, the Badami Chalukyas is still debated. Whatever the Western Chalukya origins, Kannada remained their language of administration and the Kannada and Sanskrit literature of their time was prolific. Tailapa II, a feudatory ruler from Tardavadi (modern Bijapur district), re-established the Chalukya rule by defeating the Rashtrakutas during the reign of Karka II. He timed his rebellion to coincide with the confusion caused by the invading Paramara of Central India to the Rashtrakutas capital in 973. This era produced prolonged warfare with the Chola dynasty of Tamilakam for control of the resources of the Godavari River–Krishna River doab region in Vengi. Someshvara I, a brave Chalukyan king, successfully curtailed the growth of the Chola Empire to the south of the Tungabhadra River region despite suffering some defeats while maintaining control over his feudatories in the Konkan, Gujarat, Malwa and Kaḷinga regions. For approximately 100 years, beginning in the early 11th century, the Cholas occupied large areas of South Karnataka region (Gangavadi).