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We study two-dimensional eternal black holes with non-zero mass, where eachasymptotic boundary is in contact with a CFT on a circle, following the doublyholographic braneworld models constructed in [arXiv:2006.04851,arXiv:2010.00018, arXiv:2010.16398]. We compute the Page curve of the blackhole (or the bath CFTs), which amounts to finding different geodesics in thebulk BTZ geometry with a Randall-Sundrum brane falling into the black hole. Wealso explore the possibility of including an intrinsic JT gravity action on thebrane. As expected, the generalized entropy rises linearly at early times.However, there is a transition to a late-time phase in which the entropyremains constant. The value of the late-time entropy depends on the size of thethermal baths. For a small size, it corresponds to the thermal entropy of thebaths, while for large size, it corresponds to twice the horizon entropy of theblack hole. The critical size and the Page time are proportional to ratio ofthe central charges of the conformal defect and the bath CFT.

Quantum Extremal Islands Made Easy, Part IV: Massive Black Holes on the Brane