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A sister castle or twin castle relationship is the castle equivalent of sister city, between two geographically distinct castles, usually by agreement between two local governments famous for castles.
Some Japanese castles establish sister relationships with not only domestic castles but also European castles.

Details

On 26 March 2015, Conwy Castle in Wales was twinned with Himeji Castle. Both castles are World Heritage Sites.

The term friendship castle alliance (友好城郭) is also used, but it is distinguished from sister castle(姉妹城) like the examples of Himeji Castle and Osaka castle.

List of sister castles and friend castles

Date		Castle 1		Distinction		Castle 2		Distinction		ref.
1966, 15 August			Hikone Castle	National Treasure National Special Historic Site of Japan			Takamatsu Castle	Important Cultural Property National Historic Site of Japan National Place of Scenic Beauty
1983, 29 April			Nagahama Castle	-			Osaka Castle	Important Cultural Property National Special Historic Site of Japan
1985, 2 November			Osaka Castle	Important Cultural Property National Special Historic Site of Japan			Wakayama Castle	Important Cultural Property National Historic Site of Japan National Place of Scenic Beauty
1989, 2 November			Marksburg	World Heritage Site			Maruoka Castle	Important Cultural Property
1989, 11 May			Château de Chantilly	-			Himeji Castle	World Heritage Site National Treasure National Special Historic Site of Japan
2006, 10 October			Osaka Castle	Important Cultural Property National Special Historic Site of Japan			Ueda Castle	National Historic Site of Japan
2009, 2 October			Schloss Eggenberg	World Heritage Site			Osaka Castle	National Historic Site of Japan Special Historic Sites
2015, 26 March			Himeji Castle	World Heritage Site National Treasure National Special Historic Site of Japan			Neuschwanstein Castle	-
2017, 11 April			Château des ducs de Bretagne	Monument historique			Osaka Castle	Important Cultural Property National Special Historic Site of Japan
2019, 29 October			Conwy Castle	World Heritage Site Listed building-Grade 1			Himeji Castle	World Heritage Site National Treasure National Special Historic Site of Japan
2022, 3 October			Osaka Castle	Important Cultural Property National Special Historic Site of Japan			Castello Sforzesco	-

See also

• Sister city

References

1. "Conwy and Himeji castles' twinning starts 'beautiful friendship'".
2. "【お城TOPICS】姫路城とコンウィ城が姉妹城に".
3. "彦根市について" (in Japanese).
4. ^ "大阪城天守閣九十年の歴史" (in Japanese).
5. "レファレンス事例詳細" (in Japanese).
6. "越前 丸岡城" (PDF) (in Japanese).
7. ^ "姉妹都市（海外・国内）/姉妹城" (in Japanese).
8. ^ "姫路市の海外姉妹・友好都市、姉妹城、観光交流城" (in Japanese).
9. "「姉妹城・友好城郭紹介」パネル展示コーナーに「スフォルツェスコ城」が加わりました" (in Japanese).

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