Emperor Horikawa was the 77th emperor of Japan, reigning from 1087 to 1107 during the late Heian period. He was born on July 18, 1079, and was the son of Emperor Shirakawa. His reign is noted for the continued influence of the Fujiwara clan and the political power struggles that characterized the era. During his time as emperor, Horikawa faced challenges from powerful regents and military leaders. His reign saw the rise of the samurai class, which would later play a significant role in Japanese history. Emperor Horikawa passed away on July 24, 1107, and was succeeded by his son, Emperor Toba.