The Sassa clan was said to originally belong to Nobuyasu ODA, a guard of Owari and head of the Iwakura-jo Castle (Bukoyawa) and according to Shinchoko-ki (biography of Nobunaga ODA), there is a anecdote that since there was a rumor that Narimasa attempted to assassinate Nobunaga ODA, Narimasa apologized.
佐々氏は、元々は尾張守護代・岩倉城主、織田信安に属していたとされ（武功夜話）、信長公記首巻によれば、成政は織田信長暗殺を企んだという風聞が流れ、釈明したという話が残っている。