Viscount Masanari Takagi was a Japanese entomologist, nobleman, and, in his capacity as a viscount, a politician in the House of Peers. He was the father of Yuriko, Princess Mikasa, wife of Takahito, Prince Mikasa, the youngest brother of Emperor Hirohito.
Source: “Masanari Takagi”, English Wikipedia (CC BY-SA 4.0), excerpt