Fujiwara no Michinaga
The Reizei family descended from Fujiwara no Michinaga through his sixth son, Nagaie (1005-1064); this line was known by the name of Mikohidari until Tamesuke took the name of Reizei. Nagaie's second son Tadaie (1033-1091) had a second son, Toshitada (1071-1123), whose fourth son Toshinari (also known as Fujiwara no Shunzei, 1114-1204) had a second son, Sadaie (also known as Fujiwara no Teika, 1162-1241), whose third son Tameie (1198-1275) was Reizei Tamesuke's father.