Kansai dialect
Historically, extensive use of keigo (honorific speech) was a feature of the Kansai dialect, especially in Kyōto, while the Kantō dialect, from which standard Japanese developed, formerly lacked it. Keigo in standard Japanese was originally borrowed from the medieval Kansai dialect. However, keigo is no longer considered a feature of the dialect since Standard Japanese now also has it. Even today, keigo is used more often in Kansai than in the other dialects except for the standard Japanese, to which people switch in formal situations.