Tokyo is the de facto capital of Japan, where the seat of the Government of Japan and home of the Emperor are located. While this is generally accepted, the capital de jure is disputed by some people. Some supporters of the argument that Tokyo is the de jure capital city of Japan cite the 1868 establishment of Tokyo prefecture as the date that it became the capital. Others state that it occurred when Edo Castle became Tokyo Castle that same year, and still others say that it occurred when Tokyo Castle became the Imperial Castle (now the Kōkyo) in 1869. Historically speaking, while there was an imperial edict transferring the capital to Heian-kyō, such a basis has never been provided for the transfer from Kyoto to Tokyo. So, today, there are some people who argue that since the transfer to Heiankyo was valid, Kyoto is still the capital of Japan, while some say that Tokyo and Kyoto are simultaneously capitals of Japan.