We report the spectroscopic confirmation of a sub-mm galaxy (SMG) at z = 4.547 with an estimated L IR = 0.5−2.0×10 13 L ⊙ . The spectra, mid-IR, and X-ray properties indicate the bolometric luminosity is dominated by star formation at a rate of > 1000M ⊙ yr −1 . Multiple, spatially separated components are visible in the Ly-Alpha line with an observed velocity difference of up to 380 km/sec and the object morphology indicates a merger. The best fit spectral energy distribution and spectral line indicators suggest the object is 2-8 Myr old and contains > 10 10 M ⊙ of stellar mass. This object is a likely progenitor for the massive early type systems seen at z ∼ 2.