Sister castle

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 March 26, 2015, Conwy Castle in Wales was twinned with Himeji Castle. Both castles are World Heritage Sites.^[1]^[2]

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.^{[citation needed]}

List of Sister Castles and Friend Castles


	Sister castle relationship(姉妹城)
	Friendship castle alliance(友好城郭)

Date		Distinction		Distinction	ref.
1966, August 15	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	^[3]
1983, April 29	Nagahama Castle	-	Osaka Castle	Important Cultural Property National Special Historic Site of Japan	^[4]
1985, November 2	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	^[4]
1989, November 2	Marksburg	World Heritage Site	Maruoka Castle	Important Cultural Property	^[5]^[6]
1989, May 11	Château de Chantilly	-	Himeji Castle	World Heritage Site National Treasure National Special Historic Site of Japan	^[7]^[8]
2006, October 10	Osaka Castle	Important Cultural Property National Special Historic Site of Japan	Ueda Castle	National Historic Site of Japan	^[4]
2009, October 2	Schloss Eggenberg	World Heritage Site	Osaka Castle	National Historic Site of Japan Special Historic Sites	^[4]
2015, March 26	Himeji Castle	World Heritage Site National Treasure National Special Historic Site of Japan	Neuschwanstein Castle	-	^[7]^[8]
2017, April 11	Château des ducs de Bretagne	Monument historique	Osaka Castle	Important Cultural Property National Special Historic Site of Japan	^[4]
2019, October 29	Conwy Castle	World Heritage Site Listed building-Grade 1	Himeji Castle	World Heritage Site National Treasure National Special Historic Site of Japan	^[8]
2022, October 3	Osaka Castle	Important Cultural Property National Special Historic Site of Japan	Castello Sforzesco	-	^[9]