Tenshu (天守, 殿主, 殿守 also called tenshukaku , 天守閣) is the central tower or main keep of a Japanese castle. It is the most defining feature of the Japanese castle. Although previous castles usually had a defensible structure for residence and/or administration, the architecturally distinct tenshu was first constructed during the late Sengoku period, or Azuchi–Momoyama period (1573–1603). Azuchi Castle, built in 1576 by Oda Nobunaga, was Japan's first castle to have a tenshu.
- The Compact Nelson Japanese-English Dictionary, Charles E. Tuttle Company, Tokyo 1999, ISBN 4-8053-0574-6
- Kenkyusha's New Japanese-English Dictionary, Kenkyusha Limited, Tokyo 1991, ISBN 4-7674-2015-6
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