The Novgorodsko-Sofiysky Svod (Russian: Новгородско-Софийский свод, Novgorod-Sofia Compilation) is a tentative name for a hypothetical common source for the Novgorod Fourth Chronicle and the Sofia First Chronicle, according to Russian philologist Aleksey Shakhmatov.[1]
Shakhmatov initially dated it by the year 1448 (hence it also used to be called 1448 compilation; Russian: "свод 1448 г."), but later revised his opinion to the 1430s.[1] Some Russian philologists shared his opinion, while others attribute the common source to the 1418 compilation of the 15th century Photius, Metropolitan of Moscow.[2]