Found in 1502.
In the 16th century, the Portuguese reached Japan, and soon started trade and missionary work. Nagasaki was then the only Japanese port open for foreign commerce. The Portuguese introduced many then-unusual things, such as guns, tobacco, and pumpkins - and castella. It was able to be preserved for a long period of time, and so was useful for the sailors who were out on the sea for months. In the Edo-era, in part due to the cost of sugar, it was an expensive dessert. When Japanase emperor's envoy was invited, the Tokugawa Shogunate presented the Castella. Over the years, the taste changed to suit Japanese palates.
Casdos is a may older than Castella
Gobo-mochi is a probably came from China
Castella is made of natural ingredients, so its simple taste is a favorite of many Japanese people. There are now many varieties made with ingredients such as powdered green tea, brown sugar, and honey. They may be molded in various shapes; a popular Japanese festival food is baby castella, a bite-sized version.