The flag of the Klein Vrystaat (KVS) is almost identical to the Transvaal's own Vierkleur: a horizontal red-white-blue triband with a vertical green stripe near the hoist.

The KVS was mainly a European (largely Afrikaner) community located on Swazi-owned land along the kingdom's southwestern border with the Transvaal, which was granted in 1877 by iNgwenyama Mbandzeni Dlamini to two hunters: Joachim Johannes Ferreira and Frans Ignatius Maritz.

What Mbandzeni thought he had granted was in the nature of a permanent grazing concession, but Ferreira and Maritz opened up the territory to Afrikaner settlement and subdivided it into small farms.

[1] White settlers arrived in greater numbers throughout the 1880s, after the discovery of gold in neighboring Transvaal and at Piggs Peak and Forbes Reef in Swaziland.

Mswati's son, Mbandzeni, granted large chunks of his territory in concessions to the new arrivals, emboldening the Boers to ignore his claims to most of the rest, and, by the time Swaziland became a protectorate of the South African Republic in 1894, there was precious little land left.

By the terms of the first Swaziland Convention (1890), the Little Free State KVS was incorporated into the ZAR, with the accord of the British, as part of the Piet Retief, Mpumalanga district.