Namesakes
Eustace
(a.k.a. Placidus) (m) ?-118 
Saints
Johann II, Prince of Liechtenstein
(a.k.a. Placidus) (m) 1840-1929
Other Royalty 1858-1929 Liechtenstein (prince)
Placidus
(m) ?-3xx
Saints
Placidus
(m) ?-541
Saints
Placidus of Autun
(m) ?-675
Saints