In November of AD 644, he built the residences in Amagashino-oka Hill, named them respectively "Kaminomiya" (upper shrine) and "Tani no Miya-mon" (Palace Gate of Valley), and even called his own children princes.
644年（皇極天皇3年）11月には甘樫丘に邸宅を築き、これをぞれぞれ「上の宮門（みかど）」、「谷の宮門」とし、さらに自分の子女達を皇子と呼ばせた。