徳川家重
The era's name was changed to "Kanpō" in February 1741 due to the belief in Chinese astrology that the 58th year of the sexagenary cycle brings changes. The provinces of Musashi, Kōzuke, Shimotsuke, and Shinano all had noteworthy devastation from a major flood that occurred in 1742. In Heian-kyō, the Sanjo Bridge was also washed away in this destructive storm cycle. During the close of the Kanpō era, a comet was seen and recorded in the "Nihon Ōdai Ichiran", a consensus by later researches state that the comet was likely C/1743 X1 (De Cheseaux). The fourth and final era during Sakuramachi's reign began in 1744, and was called "Enkyō" (meaning "Becoming Prolonged"). This new era was created to mark the start of a new 60-year cycle of the Chinese zodiac. The last two major events during Sakuramachi's reign occurred in 1745, when Tokugawa Ieshige became the new shogun. The first establishment of a market fair in the capital was to be found at Hirano Shrine in Ōmi Province, while in Edo a great fire swept through the city.