John Wilson was the Anglicized name of Captain Frederick Walgren, (8 July 1851-5 August 1899) a Swedish sailor and o-yatoi gaikokujin (foreign professional) who was active in the development of British-Japanese ties in the late 19th century.
Wilson initially resided in Nagasaki, Kyūshū, living next-door to Thomas Blake Glover.
The Sei-Kyo Maru was hit by four 12-inch shells, lost the protection of the main body of the fleet during the engagement, and was attacked by torpedo boats.
For these and other heroic naval exploits, including a daring rescue of a ship during stormy seas, John Wilson received recognition from the Meiji Emperor of Japan, and received the sixth rank of the Japanese Order of the Rising Sun at the Imperial Palace in Edo on 25 December 1895.
A great-granddaughter of Captain John Wilson, Marianne Wilson (born Mary Ann Vaughn) was the subject of a highly controversial and widely reported case in international family law, Sweden v. Yamaguchi, decided in the Tokyo High Court in 1956.