In the generation of Yukihide SHINGU, they were defeated in struggles with the Horinouchi clan (Shingu Horinouchi family); subsequently the Horinouchi clan ruled the Shingu clan, but a son of Ujiyoshi HORINOUCHI used the Shingu family name and gave himself the name Yukitomo SHINGU.
新宮行栄の代で堀内氏（新宮堀内家）との抗争に敗れ、その後、新宮は堀内氏が支配したが、堀内氏善の子が新宮姓を称し新宮行朝と名乗った。