One of Shitennoji 's four temples, the "Seyakuin" was built by Prince Shotoku in the first year of the reign of Empress Suiko (593). A Seyakuin was a welfare facility established in accordance with Buddhist teachings, cultivating medicinal herbs and providing them to people of all ages. Prince Shotoku later lectured on the Sutra of the Victory over the Sutra and enshrined a statue of Lady Srimala (Lady Victory) in the main hall, leading to the temple's nickname "Shomanin." The main hall houses the principal image of Aizen Myoo, renowned for his ability to find love and bring harmony to marriage, leading to the temple's nickname "Aizen-do." The temple grounds are home to the Tahoto Pagoda (a nationally important cultural property), a masterpiece of the Momoyama period rebuilt by Toyotomi Hideyoshi, as well as the "Aizen no miraculous water," said to grant love when drunk, making it popular among young women. The Aizen Festival, famous as one of Osaka's three major summer festivals, is held every year on June 30th and July 1st and 2nd.