Hikone Castle

Timeline

1. 1600

   Sekigahara merit

   Ii Naomasa served as a Tokugawa vanguard during the decisive 1600 battle and was rewarded with an 180,000-koku Omi domain centered on Sawayama Castle, the founding moment of the Hikone domain.

2. 1602

   Death of Naomasa

   Ii Naomasa died from his battle wounds; his still-young heir Naotsugu took over the Ii clan.

3. 1603

   Construction begins

   Senior retainer Kimata Morikatsu carried out Naomasa's plans, launching a tenka-bushin project involving twelve daimyo from seven provinces.

4. 1606

   Tenshu completed

   The three-tier tenshu was finished; tradition holds it was relocated from the Otsu Castle keep, the basis for one of the future National Treasure keeps.

5. 1614

   Ii Naotaka inherits

   Around the Osaka Winter Campaign, the sickly Naotsugu yielded leadership to his younger brother Naotaka, who accelerated the castle's completion.

6. 1622

   Castle completed

   The Tenbin-yagura, Nishinomaru three-tier yagura, Otemon gate, and other principal buildings were finished, ending an 18-year phased construction.

7. 1677

   Genkyu-en built

   The fourth lord Ii Naooki built Genkyu-en, a stroll-style daimyo pond garden modeled after China's Eight Views of Xiaoxiang.

8. March 3, 1860

   Sakuradamon Incident

   Hikone lord and tairo Ii Naosuke was assassinated outside the Sakurada Gate of Edo Castle, ending the Ansei Purge and triggering decisive bakumatsu turmoil.

9. 1878

   Imperial preservation

   Slated for demolition under the castle abolition order, the keep was saved by imperial decree during Emperor Meiji's Hokuriku tour on Okuma Shigenobu's advice.

10. 1951

    Important Cultural Properties

    Hikone Castle site was designated a National Historic Site, and the tenshu, Tsuke-yagura, Tamon-yagura, Tenbin-yagura and other structures (six in total) became Important Cultural Properties.

11. 1952

    National Treasure designation

    The tenshu together with the Tsuke-yagura and Tamon-yagura were elevated to National Treasures, placing Hikone among the five castles (Matsumoto, Inuyama, Matsue, Himeji, Hikone) with a National Treasure keep.

12. 1956

    Special Historic Site

    Hikone Castle site was elevated to Special Historic Site status, securing the highest level of cultural heritage protection for the entire grounds.

13. 1992

    World Heritage tentative list

    Inscribed on Japan's UNESCO World Heritage tentative list, continuing as the second Japanese castle candidate after Himeji.

Detailed History

Hikone Castle began with Ii Naomasa (1561-1602), one of the Tokugawa Four Heavenly Kings, who served as a vanguard in 1600 and was awarded a 180,000-koku domain in northern Omi, taking over Sawayama Castle, former seat of Ishida Mitsunari. Disliking Sawayama's medieval layout, Naomasa planned a new castle but died in 1602 from his battle wounds. Because his heir Ii Naotsugu (1590-1662) was a child, the senior retainer Kimata Morikatsu carried out Naomasa's vision, beginning construction on Mount Konki in 1603. The project was a tenka-bushin (nationwide public work) mobilising twelve daimyo from seven provinces including Owari and Echizen. The three-tier tenshu was completed in 1606 and Naotsugu moved in. Tradition holds the keep was relocated and rebuilt from the Otsu Castle keep, but this has never been historically confirmed. Around the Osaka Winter Campaign in 1614 the sickly Naotsugu was succeeded by his younger brother Ii Naotaka (1590-1659). A third construction phase from 1616 added the palace, and by 1622 the Tenbin-yagura, the Nishinomaru three-tier yagura, the Otemon gate, and other major structures were complete. By 1633 the Ii held the largest fudai-daimyo domain of 350,000 koku. Hikone was the seat of the Ii for fourteen generations across the Edo period. The bakumatsu lord Ii Naosuke (1815-1860) served as tairo, concluded the 1858 Japan-US Treaty of Amity and Commerce, led the Ansei Purge, and was assassinated in 1860 in the Sakuradamon Incident. After the Meiji Restoration the keep was scheduled for demolition under the castle abolition order but saved by imperial decree during Emperor Meiji's 1878 Hokuriku tour on Okuma Shigenobu's advice, then granted to the last lord Ii Naonori. The castle was donated to Hikone City in 1944. In 1951 the site became a National Historic Site and six structures including the keep were Important Cultural Properties; in 1952 the tenshu plus its Tsuke-yagura and Tamon-yagura became National Treasures, placing Hikone among the five castles whose keep holds that status. The site was promoted to Special Historic Site in 1956, and the Umaya stables joined the Important Cultural Properties list in 1963. UNESCO World Heritage tentative-list inscription followed in 1992; Shiga and Hikone continue to pursue full inscription as Japan's second castle World Heritage Site after Himeji.

Cultural Significance

Hikone was seat of the Ii clan, head of the fudai daimyo with a 350,000-koku domain, and ranks among the five castles (Hikone, Matsumoto, Inuyama, Matsue, Himeji) whose keep is a National Treasure, a flagship of the twelve surviving original keeps and an emblem of the Edo shogunate order. The 1952 designation rests on the keep's preservation of early Edo design and quality on par with the other four. The Ii were the leading house of the Tokugawa Four Heavenly Kings, famed since the Sekigahara campaign for the akazonae (all-red equipment) of their warriors, and produced six tairo during the Edo period. Ii Naosuke, who led the Ansei Purge of 1858-59, remains a debated figure in modern historiography, dramatized in Shiba Ryotaro's novel Hana no Shogai and in NHK Taiga dramas Hana no Shogai (1963), Tokugawa Yoshinobu (1998), and Reach Beyond the Blue Sky (2021). Genkyu-en and Rakuraku-en, modeled after China's Eight Views of Xiaoxiang in Hunan, served as a regional centre of Confucian and Chinese-poetry culture. Hikonyan, the mascot introduced in 2007 for the castle's 400th anniversary, became a nationally beloved figure as an early yuru-chara hit and a major tourism draw.

Architectural Details

Hikone sits on Mount Konki (about 50 m), a hilltop fortress defended by three concentric water moats and earthen ramparts. The principal structures are the tenshu (National Treasure, 1606), the Tsuke-yagura and Tamon-yagura (both National Treasures), and as Important Cultural Properties the Tenbin-yagura, the Nishinomaru Sanju-yagura, the Taiko-mon yagura, the Ni-no-maru Sawaguchi Tamon-yagura, and the Umaya stables (designated 1963), together with Genkyu-en and Rakuraku-en (Place of Scenic Beauty). The three-tier irimoya-zukuri tenshu is traditionally said to have been moved and rebuilt from the Otsu Castle keep, though this is unconfirmed. Among the five National Treasure keeps it is the most decoratively elaborate, combining three gable types (irimoya, kirizuma, karahafu), with kato-mado (cusped windows) on the top floor and a roofline alternating chidori-hafu and karahafu gables. The Tenbin-yagura, with symmetrical two-story turrets at either end joined by a watari-yagura over a drawbridge moat, allows two-directional fire and is the strategic linchpin of the defense; tradition links it to the Nagahama Castle main gate but this is unverified. Genkyu-en (Place of Scenic Beauty, built 1677 by Ii Naooki) is a stroll-style daimyo pond garden after the Eight Views of Xiaoxiang, and Rakuraku-en is a sukiya-style daimyo residence with palace and tea-room buildings.