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We report the discovery with TESS of a remarkable quadruple star system witha 2+1+1 configuration. The two unique characteristics of this system are that(i) the inner eclipsing binary (stars Aa and Ab) eclipses the star in theoutermost orbit (star C), and (ii) these outer 4th body eclipses last for$\sim$12 days, the longest of any such system known. The three orbital periodsare $\sim$3.3 days, $\sim$51 days, and $\sim$2100 days. The extremely longduration of the outer eclipses is due to the fact that star B slows binary Adown on the sky relative to star C. We combine TESS photometric data,ground-based photometric observations, eclipse timing points, radial velocitymeasurements, the composite spectral energy distribution, and stellar isochonesin a spectro-photodynamical analysis to deduce all of the basic properties ofthe four stars (mass, radius, $T_{\rm eff}$, and age), as well as the orbitalparameters for all three orbits. The four masses are $M_{\rm Aa}=0.382$M$_\odot$, $M_{\rm Ab} =0.300$M$_\odot$, $M_{\rm B} =0.540$M$_\odot$ and$M_{\rm C} =0.615$M$_\odot$, with a typical uncertainty of 0.015 M$_\odot$.

TIC 114936199: A Quadruple Star System with a 12-day Outer Orbit Eclipse