noun
three noble families (Kan'in, Kazan'in, Nakanoin or Koga)
Historical term referring to specific court noble lineages in the Heian period. The exact families may vary by context.
平安時代の三家には、閑院流や花山院流などが含まれる。
The three noble families of the Heian period included the Kan'in and Kazan'in lineages.
noun
three branches of the Tokugawa family (Owari, Kii, Mito)
Historical term for the three collateral Tokugawa houses that could provide a shogunal heir. Compare with 御三家, which often refers to the same three families but can also be used figuratively.
See also: 御三家
徳川御三家は、尾張、紀伊、水戸の三家を指す。
The Tokugawa Gosanke refers to the three houses of Owari, Kii, and Mito.