E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Pious (2 syl.).
The Romans called a man who revered his father pius; hence Antoninus was called pius, because he requested that his adopted father (Hadrian) might be ranked among the gods. Æneas was called pius because he rescued his father from the burning city of Troy. The Italian word pietà (q.v.) has a similar meaning.
The Pious. Ernst I., founder of the House of Gotha. (16011674.)