Adriano Banchieri Bolognese(1568-1634)
L'Organo suonarino Opera Terza Decima(Ricciardo Amadino, Venetia, 1605)
No.6 Sonata Sesta, Fuga triplicata
As the word “triplicata” indicates, there are three motives (which are not really subjects), but they are all derivative forms of the tetrachord, so they are not independent.
http://aeolianconsort.chakin.com/Banchieri.htm#LOrgano_sonarino_Banchieri
