 Nobunaga relocated from Kiyosu to Iwakura Castle in 1563.After Nobunaga's death, Toyotomi Hideyoshi assembled his retainers at Kiyosu Castle and proclaimed his regency over Nobunaga’s infant grandson, Oda Hidenobu.Kiyosu Castle itself came under the control of Nobunaga’s second son, Oda Nobukatsu, who began large scale renovations in 1586, which included a double ring of moats, as well as a large and a small donjon It was remodeled by expanding the castle grounds to roughly 1.6 km east to west and 2.8 km north to south.