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We explore the possibility that the N-rich young proto-galaxy GN-z11 recentlyobserved at z=10.6 by the James Webb Space Telescope is the result of theformation of second generation stars from pristine gas and Asymptotic GiantBranch (AGB) ejecta in a massive globular cluster or nuclear star cluster. Weshow that a second generation forming out of gas polluted by the ejecta ofmassive AGB stars and mixed with gas having a standard composition accounts forthe unusually large N/O in the GN-z11 spectrum. The timing of the evolution ofmassive (4-7.5M$_{\odot}$) AGBs also provides a favourable environment for thegrowth of a central stellar mass black hole to the Active Galactic Nucleusstage observed in GN-z11. According to our model the progenitor system was bornat an age of the Universe of $\simeq 260 - 380$Myr, well within thepre-reionization epoch.

GN-z11: witnessing the formation of second generation stars and an accreting massive black hole in a massive star cluster