seiton

Seiton is a Japanese term that translates to "second son" in English. It is a title used in the Japanese nobility and samurai class to refer to the second son of a daimyo, or lord. The seaton was traditionally considered to be of lower status than the eldest son, known as the daisho, who would inherit the family's title and lands. The seaton was often given a lower-ranking domain or was sent to study abroad, particularly in China, to gain knowledge and experience. The seaton's role was to support the daisho and maintain the family's lineage and reputation. The term seaton is also used in modern Japanese to refer to the second son of a family, regardless of social status.