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The earliest galaxies are expected to emerge in the first billion years ofthe Universe during the Epoch of Reionization. However, both the spectroscopicconfirmation of photometrically-selected galaxies at this epoch and thecharacterization of their early dynamical state has been hindered by the lackof bright, accessible lines to probe the velocity structure of theirinterstellar medium. We present the first ALMA spectroscopic confirmation ofsuch sources at z > 6 using the far-infrared [C II]{\lambda}157.74{\mu}memission line, and, for the first time, measurement of the velocity structure,for two galaxies at z = 6.8540+/-0.0003 and z = 6.8076+/-0.0002. Remarkably,the [C II] line luminosity from these galaxies is higher than previously foundin `normal' star-forming galaxies at z > 6.5. This suggests that we aresampling a part of the galaxy population different from the galaxies foundthrough detection of the Ly{\alpha} line. The luminous and extended [C II]detections reveal clear velocity gradients that, if interpreted as rotation,would suggest these galaxies have turbulent, yet rotation-dominated disks, withsimilar stellar-to-dynamical mass fractions as observed for H{\alpha} emittinggalaxies 2 Gyr later at cosmic noon. Our novel approach for confirming galaxiesduring Reionization paves the way for larger studies of distant galaxies withspectroscopic redshifts from ALMA. Particularly important, this opens upopportunities for high angular-resolution [C II] dynamics in galaxies less thanone billion years after the Big Bang.

Rotation in [CII]-emitting gas in two galaxies at a redshift of 6.8