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Observations of quasars reveal that many supermassive black holes (BHs) werein place less than 700 million years after the Big Bang. However, the origin ofthe first BHs remains a mystery. Seeds of the first BHs are postulated to beeither light (i.e., $10-100~\rm{M_{\odot}})$, remnants of the first stars orheavy (i.e., $10^4-10^5~\rm{M_{\odot}})$, originating from the direct collapseof gas clouds. Harnessing recent data from the Chandra X-ray Observatory, wereport the detection of an X-ray-luminous massive BH in agravitationally-lensed galaxy identified by JWST at $z\approx10.3$ behind thecluster lens Abell 2744. This heavily-obscured quasar with a bolometricluminosity of $L_{\rm bol}\sim5\times10^{45}~\rm{erg\ s^{-1}}$ harbors a$M_{\rm BH}\sim10^7-10^8~\rm{M_{\odot}}$ BH assuming accretion at the Eddingtonlimit. This mass is comparable to the inferred stellar mass of its host galaxy,in contrast to what is found in the local Universe wherein the BH mass is$\sim0.1\%$ of the host galaxy's stellar mass. The combination of such a highBH mass and large BH-to-galaxy stellar mass ratio just $\sim$500 Myrs after theBig Bang was theoretically predicted and is consistent with a picture whereinBHs originated from heavy seeds.

Evidence for heavy seed origin of early supermassive black holes from a z~10 X-ray quasar