Namesakes
Flavius Justinus
(a.k.a. Justinus) (m) c. 450-527 
Roman and Byzantine Emperors 518-527
Flavius Justinus Junior
(a.k.a. Justinus) (m) c. 520-578
Roman and Byzantine Emperors 565-578
Martinus J. G. Veltman
(a.k.a. Justinus) (m) 1931-2021
Nobel Prize Winners 1999 (physics)
Notable Scientists and Inventors
Justinus van der Brugghen
(m) 1804-1863
Dutch Prime Ministers 1856-1858