They are mentioned in most other books of the series.
Other members of the family are mentioned in 1156 and 1159.
The town was first mentioned in 1230 as a city.
The place name was first mentioned in the 12th century.
His name is mentioned in the history of 8th class.
The name of the current form was first mentioned in 1907.
Not a lot of his past is mentioned in the show.
His real first name is never mentioned in the series.
However, a specific city or state is never mentioned in the show.
The town was first mentioned in the 1st half of the 16th century.