The family lineage of Naganori was originated from Takayoshi TODO (Nagahide NIWA's son), who was an adopted child of Takatora TODO, the first lord of the domain.
長徳の家系は、初代藩主・藤堂高虎の養子・藤堂高吉（丹羽長秀の子）から始まる家系であった。