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Long-term precise radial velocity (RV) monitoring, as well as anomalies in the system proper motion, has suggested the presence of an additional, inner companion in the system.<\/jats:p><jats:p><jats:italic>Methods.<\/jats:italic>Using information from ongoing precision RV measurements with the HARPS spectrograph, as well as<jats:italic>Gaia<\/jats:italic>host star astrometry, we have undertaken a multi-epoch search for the purported additional planet using the VLTI\/GRAVITY instrument.<\/jats:p><jats:p><jats:italic>Results.<\/jats:italic>We report a high-significance detection over three epochs of the companion HD 206893c, which shows clear evidence for Keplerian orbital motion. Our astrometry with \u223c50\u2212100 \u03bcarcsec precision afforded by GRAVITY allows us to derive a dynamical mass of 12.7$ ^{+1.2}_{-1.0} $<jats:italic>M<\/jats:italic><jats:sub>Jup<\/jats:sub>and an orbital separation of 3.53$ ^{+0.08}_{-0.06} $ au for HD 206893c. Our fits to the orbits of both companions in the system use both<jats:italic>Gaia<\/jats:italic>astrometry and RVs to also provide a precise dynamical estimate of the previously uncertain mass of the B component, and therefore allow us to derive an age of 155 \u00b1 15 Myr for the system. We find that theoretical atmospheric and evolutionary models that incorporate deuterium burning for HD 206893c, parameterized by cloudy atmosphere models as well as a \u201chybrid sequence\u201d (encompassing a transition from cloudy to cloud-free), provide a good simultaneous fit to the luminosity of both HD 206893B and c. Thus, accounting for both deuterium burning and clouds is crucial to understanding the luminosity evolution of HD 206893c.<\/jats:p><jats:p><jats:italic>Conclusions.<\/jats:italic>In addition to using long-term RV information, this effort is an early example of a direct imaging discovery of a bona fide exoplanet that was guided in part by<jats:italic>Gaia<\/jats:italic>astrometry. Utilizing<jats:italic>Gaia<\/jats:italic>astrometry is expected to be one of the primary techniques going forward for identifying and characterizing additional directly imaged planets. In addition, HD 206893c is an example of an object narrowly straddling the deuterium-burning limit but unambiguously undergoing deuterium burning. Additional discoveries like this may therefore help clarify the discrimination between a brown dwarf and an extrasolar planet. 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