The climate of Kevratas is intensely cold and intemperate, with frequent severe weather conditions which include ice, sleet and snow. Even at the planetary equator, Kevratas is far colder than the average Class M temperature. (TNG novel: Death in Winter)
Colonists from Kevratas founded settlements on a number of worlds sometime prior to the 2330s. By the 2330s, Kevratas was under Romulan rule and many Romulan citizens immigrated and took up permanent residence. In 2339, Bloodfire plague ravaged the planet's native population and the Romulan government did nothing to stop it.
In 2379, the plague arose again during a period of instability on the planet. Kevrata insurgents were in rebellion against Romulan authority, taking advantage of the weakness of Praetor Tal'Aura's rule in the wake of the fall of Shinzon. Tal'Aura dispatched Commander Sela to take over the Romulan government on the planet and impose a strict system of martial law. A successful, covert intervention by current and former Starfleet officers Doctor Beverly Crusher, Captain Jean-Luc Picard, Doctor Carter Greyhorse, Lieutenant Pug Joseph and Romulan dissident Decalon produced a plague vaccination for the Kevratans and further destabilized Romulan control. (TNG novel: Death in Winter)
In 2396 another bloodfire outbreak erupted, and the disease spread to multiple other planets before Praetor Taris ordered a quarantine of the Kevratas system by the Romulan Star Navy. However, Taris seemed uninterested in acquiring the Federation's cure. Thousands of people died of starvation and disease.
In protest over the actions of the Romulan government Kevratas declared independence from the Empire in 2398. Kito, a prominent Kevratan, declared that "They've given us nothing but death and offered nothing but more pain. We owe Taris no allegiance." Taris ordered the military to crush the revolt, but General Tebok defied Taris and negotiated a settlement with Kito, ordering that relief supplies be delivered to Kevratas immediately and conducting him and other Kevratan leaders to Rator III to present their grievances to the government in Nova Roma. Taris ordered Tebok to resign but was overruled by the Romulan Senate. This began a power struggle between Taris, the Senate, and the military that eventually led to the overthrow of Taris in a coup d'etat in 2403. (STO website: The Path to 2409)
In 2379 Kevratas was entirely under Romulan administration, with Romulans serving as planetary officials and providing security for the system. A rebel movement existed in hiding under the leadership of Hanafaejas and received broad support from the people of Kevratas. (TNG novel: Death in Winter)
The original architecture of Kevratas tends toward grandiose, large structures. Public buildings on the planet pre-dating the Romulan conquest are often constructed of marble, with carved wooden features and vaulted ceilings. Once Romulan rule was in place, many of these structures were adapted for higher functionality, and new construction became more utilitarian.
Kevratas is a bustling trade port for the Romulan frontier region, receiving goods from outside the empire as well as from within. Ships from Kevratas travel throughout the empire, and the central market in the capital is managed by Romulan officials. (TNG novel: Death in Winter)