Rensho

The was the assistant to the "shikken" (regent) of the Kamakura shogunate in Japan.
The rensho placed his signature next to that of the "shikken" on official orders. In 1224 the third "shikken" Hōjō Yasutoki appointed Hōjō Tokifusa as the first "rensho". From then on, the "rensho" was chosen from influential members of the Hōjō clan, but not from the main line of the clan ("tokusō"), with the one exception of Tokimune, who temporarily occupied the position from 1264 to 1268.
List of Rensho.
"Note: There are three Hōjō Shigetoki's, all different people"