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We report on deep Chandra X-ray Telescope imaging observations of 4C 63.20,one of the few known radio galaxies at z>3.5. The X-ray counterpart is resolvedinto a core plus two off-nuclear sources that (combined) account for close to30% of the total X-ray flux. Their morphology and orientation are consistentwith a diffuse, lobe-like nature, albeit compact hotspots cannot be ruled out.The broadband spectral energy distribution of 4C 63.20 can be reproduced with ajet model where the majority of the radio flux can be ascribed to synchrotronemission from the hotspots, whereas the (non-nuclear) X-ray emission isproduced via Inverse Compton (IC) off of Cosmic Microwave Background (CMB)photons within the extended lobes. This scenario is broadly consistent with theexpectation from highly magnetized lobes in a hotter CMB, and supports the viewthat IC/CMB may quench less extreme radio lobes at high redshifts.

Extended X-ray emission from the z=4.26 radio galaxy 4C 63.20