Like his father Narasimha II, Someshwara stayed back at Kannanur with Ramanatha where he was killed in 1262/1263 CE in a war with Sadayavarman Sundara Pandyan I of the Pandya dynasty.
Ramanatha also got the Manne-Nadu (Manne or Manyapura, erstwhile Ganga capital in 8th century CE near Dobbaspet) Kolar, Bangalore and eastern part of Tumkur districts under his share.
Historian B. L. Rice mentions that along with the Tamil districts, while defining the western and southern limits of Ramanatha's territory in the Karnataka region, his Kannada regions extended westward up to Devarayanadurga hills, and an imaginary line connecting Urudigere to Hebbur, and from there east to Lakkur in Malur taluk (Kolar district).
[4] Ballala III in 1301 CE issued orders in Tamil to the heads of mathas and temple priests in Ramanatha's former portion of the kingdom, remitting all taxes, and confirming the villages granted to them as endowments.
The Epigraphia Karnataka (Carnatica) of Bangalore district mentions that the Tamil inscriptions of Chakravarthi Posala Vira Ramanatha Deva were addressed to the authorities of all the temples in his kingdom.
An inscription conveys that Poysala Vira Ramanada donated 10 pens (pons) for the Chokkanathaswamy temple from the Tommalur (Tombalur or Domlur) revenue account in 1290 CE.
Inscriptions on the southern wall of Chokkanathaswamy Temple (Sokkaperumal) of village Tombalur (as Domlur was once called) in Desimanikka Pattanam dating back to the Hoysala period mention the consecration of the processional deity in 1266 CE during Ramanatha's rule, donations of door frames and dry and wet lands, remission from taxes and the engagement of an assembly of carpenters and artisans.
Historian Sakkottai Krishnaswami Aiyangar states that the territory of Maravarman Kulasekhara Pandyan I (1268–1311 CE) during the time of Hoysala Vira Ramanatha's reign, consisted of:"the region extending south from the mouth of the northern Pennar river to Cape Comorin and farther west, which included the great bulk of the Chola kingdom.
Vira Ballala III maintained three capitals at the three strategic points of the empire, namely, Halebid in the north or north-west, Kundani in the middle keeping communication with the country below (lowland plains), and Kannanur in the south, with Tiruvannamalai as an alternative.
Historian Sakkottai Krishnaswami Aiyangar further states that:"the whole country south of the line drawn from Goa, or a little north, to the mouth of the northern Pennar river, somewhere to the east of Nellore (which also formed the southern frontier of the Devagiri Sevuna Yadava and Warangal Kakatiya kingdoms and also constituted the northern frontier of the Hoysalas during the reign of the brothers Ramanatha and Narasimha III and that of their successor Vira Ballala III), was divided along a diagonal line say from Chidambaram or Cuddalore, along the main road to Tiruvannamalai and Kundani getting into the tableland a little way north of Hosur and from there to the river Krishna further north.
All north of this line (Chidambaram to Tiruvannamalai to Kundani near Krishnagiri) roughly belonged to the Hoysalas and all south to the Pandyas; the more open country along the coast right up to Nellore on the Madurai-Madras road, was a debatable frontier between these two powers.