The Koyilolugu, a record of gifts made to the
Ranganatha temple at
Srirangam, gives us a glimpse into the extensive military expeditions and the wealth of the treasury of Jatavarman Sundara Pandya. Here he styles himself :
Wars against Cheras and Cholas Sundara Pandyan I launched his initial campaign against the
Chera, then under the rule of
Viraravi Udaya Marthandavarman. The Pandyan forces decisively defeated the Chera army, culminating in the death of the Chera monarch on the battlefield. Following this victory, Sundara Pandyan redirected his military focus towards the Cholas. In the ensuing conflict,
Rajendra Chola III was vanquished and compelled to acknowledge Pandyan overlordship, marking a significant shift in the balance of power in Tamilagam.
Wars against Hoysalas Sundara Pandyan extended his military campaign into the
Hoysala dominions along the banks of the river Kaveri, where he successfully seized their southern capital,
Kannanur Koppam near
Srirangam. The incursion resulted in the death of several prominent Hoysala generals, including Singana, and yielded substantial spoils—horses, elephants, and a considerable cache of gold and treasure. The advance was eventually halted when King
Someshwara retreated into his core territories. However,
Someshwara's subsequent counteroffensive in 1262 aimed at reclaiming Pandyan lands, ended in failure and his own death, further consolidating Pandyan supremacy in the region.
Jatavarman Veera Pandyan I became the governor of the captured territories. The region remained under Pandyan rule till
Veera Ballala III recaptured the territory towards the end of the 13th century.
Wars against Kadavas Sundara Pandyan besieged the city fortress of
Sendamangalam and fought with the
Kadava king
Kopperunchinga II. However, he restored Kopperunchingan to his throne and gave him his country back. He also conquered Magadai and Kongu countries during his campaigns against the Kadavas and Hoysalas.
Invasion of Sri Lanka Responding to an appeal for help from a minister in
Sri Lanka, Jatavarman Sundara Pandyan intervened in 1258 and made
Chandrabhanu of
Tambralinga, a
Savakan usurper of the
Jaffna kingdom submit to Pandyan rule and annually offer precious jewels and elephants in tribute. A second attempt by Chandrabhanu to invade the south of the island from the north prompted the Prince Jatavarman Veera Pandyan I, brother and lieutenant of Sundara Pandyan I to intervene again in 1262–1264 on Sundara Pandyan I's behalf. Chandrabhanu was killed in this conquest and the other king of the island was subjugated. Veera Pandyan I proceeded to plant the Pandyan bull victory flag at
Koneswaram temple, Konamalai. Chandrabhanu's son
Savakanmaindan was installed and submitted to Pandyan rule on the northern Tamil throne before he too was defeated upon Sundara Pandyan I's son
Maravarman Kulasekara Pandyan I's, invasion in the late 1270s. Maravarman Kulasekara Pandyan I had succeeded his father as Lord Emperor of Pandyan following the latter's demise in 1268 and invaded to punish the Jaffna monarch for stopping the annual tributes he owed to his Pandyan overlords. The minister in charge of his invasion,
Kulasekara Cinkaiariyan, an Aryachakravarthi, was installed as the new king of the island's north. The
Aryacakravarti dynasty line of Jaffna rule thus began. ==Patronage of temples==