Ichikawa Danjuro is a stage name taken on by a series of Kabuki actors of the Ichikawa family. Most of these were blood relatives, though some were adopted into the family. It is a famous and important name, and receiving it is an honor. There are a number of roles that the line of Danjuro specialize in, as well as a series of plays, the Kabuki Juhachiban (The Kabuki Eighteen), which showcase the specialties of the Ichikawa family.
Danjuro, like other actors’ names, is bestowed (or given up) at grand naming ceremonies called shumei in which a number of actors formally change their names. The name Danjuro is generally taken at the peak of an actor’s career; another name may be taken after retirement. Prior to taking the name Danjuro, an actor frequently had the names Matsumoto Koshiro, Ichikawa Shinnosuke, or Ichikawa Ebizo.
The design of the Ichikawa family mon, three squares nested inside one another, is called mimasu or sansho. Some of the actors in this line used "Sansho" as their haimyo, a nickname or alias used in poetry circles. (source)
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