Large areas of the region were left uninhabited and many Armenians, Georgians, Russians and others subsequently migrated to Abkhazia, resettling much of the vacated territory. According to Georgian historians Georgian tribes (Mingrelians and Svans) had populated Abkhazia since the time of the Colchis kingdom. According to the census carried out in 1897 Abkhaz constituted 60-65% of the Sukhumi district's population (about 100,000; Sukhum district occupied almost the same territory as present'day Abkhazia in 1897), the majority of the rest being Georgian. However the "Encyclopædia Britannica" reported in 1911 that in the Sukhumi district (population at the time 43,000; it did not cover all the territory of present-day Abkhazia in 1911 as some of it had been transferred to Kuban governorate) two-thirds of the population were Mingrelian Georgians and one-third were Abkhaz. Those Abkhaz, who did not convert to Christianity, and who remained in Abkhazia were declared by the Russian government a "refugee population" and deprived of the right to settle in the coastal areas.