A coffin and being compos mentis

See this Roman period inscription from Mytilene: Λούκιος Βαλέρι|ος Διογένης ζῶν | καὶ φρονῶν κατεσ-|κεύασεν τὸ ἀνγεῖ-|ον ...

The ἀγγεῖον is the coffin or sarcophagus.
For φρονέω so used, cf. LSJ s.v. IV.