Four karate founders

Upper Left - Yasuhiro Konishi - Founder of Shindo Jinen Ryu
Upper Right - Tatsuo Yamada - Founder of Nihon Kempo Karate Do
Lower Left - Chojun Miyagi - Founder of Goju Ryu Karate Do
Lower Right - Gichin Funakoshi - Founder of Shotokan Karate Do