Rajarajan began his career by the conquest of the Chera country. He defeated Chera King Bhaskara Ravivarman, whose fleet he destroyed in the port of Kandalur. He also seized Pandya Amara Bhujanga and captured the port of Vilinam. By his campaign against the Singhalees he annexed northern Ceylon, building a number of stone temple in the Ceylonese capital Polonnaruva, of which one now stands to Shiva. It was at about the 14th year of his reign (AD 998-999) that most of his triumphs were achieved. He conquered the Gangas of Mysore(capital at Talakad), the country of Nolambas (Bellary and Eastern Mysore), Tadigaipadi (the district of Mysore), vengi (southern part of Northern Circars), Coorg (kudamalainadu) and the Pandyas. Having overcome the Cheras and Pandyas Rajarajan assumed the title "Mummudi Cholan". The Western and the Eastern Chalukyas of the Deccan were conquered next. His naval campaigns included victories over Lakswadeep and Maldives which laid the foundation for the later chola imperial naval conquests by his son Rajendra Chola.
He also established many hospitals called athurasalais to tend to the ailing. He developed excellent irrigation system to make his country the rice bowl of south India.His local administration includes measuring of all his kingdom and declaring a set proportion as tax free land where the revenue generated was used for charitable purposes like to temples and infirmaries. His revenue system was unique as noted in his coinage, though most of his coins bore the tiger the chola emblem on one side and the bow ( Chera), tiger and fish (pandya emblem) denoting he was the ruler of all three kingdoms, He had separate coins in which he had a man with tiger under him or Bow or Fish which might have meant for local circulation in the regions.
Abaya Kula Sekaran - The one who protects
Azhakiya Cholan - Handsome Cholan
Ranamuga Bhimar - Bhima (valiant Pandava prince) in the Warfront
Ravikula Maanickam - (Gem of the Descendents of Sun)
Raja Sarvakngar(Sarvagnan) - Royal Omniscient
Cholendra Simhar - (Chola Lion)
Uyya Kondaar -
Keralanthagar - Destroyer of Kerala(chera)
Sanda Parakiramar - The famous one who performs valiant deeds in the battlefield
Singalanthagar - Destroyer of Sinhalas
Nithavinothar - One who does soemthing innovative all the time
Nigarili Cholar - The incomparable Chozha
Panditha Cholar - The learned Chozha
Pandiya Kulanaasini - Destroyer of the Pandiyan race
Periya Perumal -
Mummudi Cholar - Chola worn all the three crowns of Chera, Chola and Pandya
Moorthivikramaabaranar -
Jananathar - Peoples King
Jeyamgonda Cholar - Victorious Chola
Keerthi Parakiramar - The famous one who performs valiant deeds
Chola Narayanar - Vaishnavite Chola
Arul Mozhi Varmar (Arumozhivarmar) - The one who utters precious words (Arumai + mozhi)
Sivapathasekaran - Humble Slave at Lord Siva’s feet