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In this paper, we exploit the gravitational lensing effect to detect propermotion in the highly magnified gravitationally lensed source MG B2016+112. Wefind positional shifts up to 6 mas in the lensed images by comparing two VeryLong Baseline Interferometric (VLBI) radio observations at 1.7 GHz that areseparated by 14.359 years, and provide an astrometric accuracy of the order oftens of $\mu$as. From lens modelling, we exclude a shift in the lensing galaxyas the cause of the positional change of the lensed images, and we assign it tothe background source. The source consists of four sub-components separated by$\sim 175$ pc, with proper motion of the order of tens $\mu$as yr$^{-1}$ forthe two components at highest magnification ($\mu\sim350$) and of the order ofa few mas yr$^{-1}$ for the two components at lower magnification ($\mu\sim2$).We propose single AGN and dual AGN scenarios to explain the source plane.Although, the latter interpretation is supported by the archivalmulti-wavelength properties of the object. In this case, MG B2016+112 wouldrepresent the highest redshift dual radio-loud AGN system discovered thus far,and would support the merger interpretation for such systems. Also, given thelow probability ($\sim10^{-5}$) of detecting a dual AGN system that is alsogravitationally lensed, if confirmed, this would suggest that such dual AGNsystems must be more abundant in the early Universe than currently thought.

Proper motion in lensed radio jets at redshift 3: a possible dual super-massive black hole system in the early Universe