Breakdown of Avus omnium prudentissimus est.
Questions & Answers about Avus omnium prudentissimus est.
Because avus is the subject of the sentence: it is the person being described as most prudent.
- avus = grandfather
- nominative singular = the grandfather as subject
So in Avus omnium prudentissimus est, avus is the one who is something.
Omnium is the genitive plural of omnis, meaning of all.
With a superlative like prudentissimus (most prudent), Latin often uses the genitive plural to show the group being compared:
- omnium = of all
- prudentissimus omnium = the most prudent of all
So the genitive answers the question most prudent of whom? → of all.