Emperor Go-Fukakusa (後深草天皇, Go-Fukakusa-tennō; 28 June 1243 – 17 August 1304) was the 89th emperor of Japan, according to the traditional order of succession. This reign spanned the years 1246 through 1260.
This 13th-century sovereign was named after the 9th-century Emperor Ninmyō and go- (後), translates literally as "later", and thus he could be called the "Later Emperor Fukakusa". The Japanese word go has also been translated to mean the "second one"; and in some older sources, this emperor may be identified as "Fukakusa, the second", or as "Fukakusa II".
Before his ascension to the Chrysanthemum Throne, his personal name (his imina) was Hisahito (久仁).
Although the Roman-alphabet spelling of the name of this 13th-century emperor is the same as that of the personal name of a current member of the Imperial family, the kanji are different:
Emperor Go-Fukakusa, formerly Prince Hisahito (久仁)
Prince Hisahito of Akishino (悠仁)
He was the second son of Emperor Go-Saga.
Empress: Saionji (Fujiwara) Kimiko (西園寺（藤原）公子) later Higashinijō‘in (東二条院), Saionji Saneuji's daughter
Second daughter: Imperial Princess Takako (貴子内親王; 1262–1273)
Third daughter: Imperial Princess Reishi (姈子内親王; 1270–1307) later Yūgimon'in (遊義門院), married Emperor Go-Uda
Consort: Tōin (Fujiwara) Inshi (洞院（藤原）愔子) later Genkimon-in (玄輝門院; 1246–1329), Tōin Saneo's daughter
Fourth daughter: Imperial Princess Hisako (久子内親王; 1272–1346) later Eiyōmon'in (永陽門院)
Second son: Imperial Prince Hirohito (熈仁親王) later Emperor Fushimi
Third son: Imperial Prince Mitsuhito (満仁親王) later Imperial Prince Priest Shonnin (性仁法親王; 1267–1304)
Court Lady: Saionji (Fujiwara) Aiko (西園寺（藤原）相子), Saionji Kinsuke's daughter
Fifth daughter: Imperial Princess Hanako/Eiko/Akiko (瑛子内親王; 1288–1352) later Yōtokumon'in (陽徳門院)
Court Lady: Saionji (Fujiwara) Moriko (西園寺（藤原）成子), Saionji Kintsune's daughter
First Son: Imperial Prince Tsunehito (常仁親王; d. 1264)