
Reconstruction began on the main keep palace of Sunpu Castle, which had burned down in a fire the previous year, and the rebuilding was completed by August. As the seat of the retired shogun Ieyasu's government, Sunpu flourished to a degree rivaling Edo itself, and Ieyasu continued to wield enormous influence over both diplomacy and domestic affairs from this base.
Hagi Castle, built by Mōri Terumoto as his new base after the Battle of Sekigahara, was completed as the political center of the Chōshū domain.
During the reconstruction of Sunpu Castle after the previous year's fire, the Honmaru palace was rebuilt and the castle keep was topped out.