Hideaki Kase (加瀬 英明, Kase Hideaki; 22 December 1936 – 15 November 2022) was a Japanese diplomatic critic known for promoting historical negationism. His father, Toshikazu Kase, was a diplomat under Shigenori Tōgō who negotiated an end to the Pacific war. Yoko Ono is his cousin.
Source: “Hideaki Kase”, English Wikipedia (CC BY-SA 4.0), excerpt