Were Miguel de Cervantes and Armand-Jean du Plessis, duc de Richelieu alive at the same time?
Yes. Miguel de Cervantes and Armand-Jean du Plessis, duc de Richelieu were alive at the same time for 30 years, from 1585 to 1616.
Armand-Jean du Plessis, duc de Richelieu was 30 when Miguel de Cervantes died.
Armand-Jean du Plessis, duc de Richelieu
French clergyman, cardinal, noble and statesman
Born 9 September 1585 · died 4 December 1642, aged 57