was the 81st emperor of Japan, according to the traditional order of succession. His reign spanned the years from 1180 through 1185. His death marked the end of the Heian period and the beginning of the Kamakura period.
During this time, the Imperial House of Japan was involved in a bitter struggle between warring clans. Minamoto no Yoritomo with his cousin Minamoto no Yoshinaka, led a force from the Minamoto clan against the Taira, who controlled the emperor. During the climactic sea Battle of Dan-no-ura in April 1185, Antoku's grandmother Taira no Tokiko took him and plunged with him into the water in the Shimonoseki Straits, drowning the child emperor rather than allowing him to be captured by the opposing forces.
This clash of clans led to numerous legends and tales. The story of Emperor Antoku and his mother's family became the subject of the Kamakura period epic poem The Tale of the Heike (Heike is an alternative reading of the Japanese characters for "House of the Taira"). Antoku's tomb is said to be located in a number of places around western Japan, including the island of IÃ Âjima, a result of the spreading of legends about the emperor and the battle.
Before his ascension to the Chrysanthemum Throne, his personal name (his imina) was Tokihito-shinnà  (è¨Âä»Â親çÂÂ). He was also known as Kotohito-shinnà Â.
His father was Emperor Takakura, and thus a grandson of retired Emperor Go-Shirakawa. His mother, Taira no Tokuko (平徳åÂÂ), second daughter of Taira no Kiyomori (平渠çÂÂ), was later referred to as Empress Dowager Kenrei (建礼éÂÂé¢, Kenrei-mon In).
Antoku was named crown prince at around one month of age. He ascended the throne at the age of two. Naturally, he held no actual power, but rather his grandfather Taira no Kiyomori ruled in his name, though not officially, as sesshà  (regent).
In the year of his enthronement, the capital was moved to modern-day Kà Âbe, Hyà Âgo, but it was soon moved back to Heian-kyà Â.
In 1183, when Minamoto no Yoshinaka entered the capital, the Taira clan fled with the young emperor and the sacred treasures to Yashima (the name of a place inside modern-day Takamatsu, Kagawa). Being defeated in ensuing battle, they fled westward.
The Taira were defeated. Antoku's grandmother, Taira no Tokiko, Kiyomori's widow, drowned herself along with the young emperor. His mother also drowned herself, but apparently, according to The Tale of the Heike (Heike Monogatari), she was pulled out with a rake by her long hair.
According to Yoshitsune's dispatch, the sacred seal was found, but the sacred sword was lost. The sword was one of the three sacred treasures.
Kugyà  (å ¬å¿) is a collective term for the very few most powerful men attached to the court of the Emperor of Japan in pre-Meiji eras.
In general, this elite group included only three to four men at a time. These were hereditary courtiers whose experience and background would have brought them to the pinnacle of a life's career. During Antoku's reign, this apex of the Daijà Â-kan included:
After his drowning, in order to mourn the body and placate any restless spirits, the Amidaji Goeidà  was built. Later, Antoku was enshrined at the Kurume-Suitengà « in Kurume, Fukuoka, and he came to be worshipped as Mizu-no-kami (æ°´ã®ç¥Â, lit. "water-god" or "god of water"), the god of easy delivery at Suitengà « (水天宮, lit. "water-heaven/emperor-shrine") everywhere.
With the establishment of Shintà  as the state religion of Japan, the Amidaji Temple was abandoned and the Akama Shrine was established in Shimonoseki in Yamaguchi Prefecture to celebrate Antoku.
The Imperial Household Agency designates Amida-ji no misasagi (é¿å½ÂéÂÂ寺éµ) near Akama Shrine in Shimonoseki as Antoku's tomb.
The years of Antoku's reign are more specifically identified by more than one era name or nengà Â.