2019 marks the beginning of the project activities of PROMETHEUS – PROtocols for information Models librariEs Tested on HEritage of Upper Kama Sites. The research project, funded by the European Union program Horizon 2020 Research & Innovation programme, Marie Skłodowska-Curie grant agreement No 821870, provides for the participation of European universities and professional societies involved in the architectural documentation of the Russian monumental cathedrals of Upper Ka