In 1198, Shigenari built a bridge across Sagami-gawa River in memory of his dead wife; Yoritomo who attended the memorial service for the completion of the bridge fell off his horse on the way home and died due to the fall.
建久9年（1198年）、重成は亡き妻のために相模川に橋をかけ、その橋の落成供養に出席した頼朝が帰りの道中で落馬し、それが元で死去している。