Dictionary of Medieval Names
from European Sources

Placentius m. Latin placens, placentius 'pleasing, satisfying, giving pleasure'.

Cf. Pleasant.

Italy
Latin
1470 Placentinus (nom) RCCaetani6 730; 1522x1532 Placentinus (nom) DSF p. 54, 56
Spain
Latin
954 placenti (gen) CDGH XLVII
Cite as: S.L. Uckelman. "Placentius". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Placentius.