Hic codex omnium veterrimus est.

Hic means this here, and in this sentence it is an adjective modifying codex.

Its form is:

• masculine
• nominative
• singular

It has to match codex in gender, number, and case. So:

• hic codex = this book / this codex

A learner often expects Latin demonstratives to behave exactly like English this, but in Latin they must agree with the noun they describe.

Codex is nominative singular.

You can tell this mainly from its job in the sentence: it is the subject of est.

So the basic structure is:

• Hic codex = the subject
• veterrimus = a predicate adjective describing the subject
• est = is

Even though codex ends in -ex, that does not make it second declension. It is actually a third-declension masculine noun:

• nominative singular: codex
• genitive singular: codicis

Not exactly.

Both can refer to a book, but codex often suggests a bound book, manuscript, or documentary volume, especially in historical or literary contexts. Liber is the more ordinary word for book in a broad sense.

So a learner may see codex and wonder why Latin did not use liber. The reason is usually nuance or context.

Because vetus has an irregular superlative.

The adjective vetus means old. Its forms are unusual:

• positive: vetus = old
• comparative: vetustior = older
• superlative: veterrimus = oldest

So veterrimus is the correct superlative form, even though it may look surprising at first.

This is something English speakers often ask because they expect a regular pattern like -issimus added directly to the base. Latin often does that, but not always.

Veterrimus is a predicate adjective.

That means it is linked to the subject by est:

• Hic codex ... veterrimus est
• This codex ... is the oldest

It agrees with codex in:

• gender: masculine
• number: singular
• case: nominative

So veterrimus is nominative singular masculine because it describes codex.

Because this is a very common Latin construction with superlatives: the partitive genitive.

• omnium = of all
• veterrimus omnium = the oldest of all

Latin often uses the genitive to show the whole group from which something is being picked out.

So here:

• hic codex = the one being singled out
• omnium = the larger group
• veterrimus = the superlative idea

English usually says the oldest of all or the oldest among all, but Latin often uses the genitive directly.

Omnium is the genitive plural of omnis, omne, which means all or every depending on context.

Here it means of all.

A quick breakdown:

• nominative singular masculine/feminine: omnis
• nominative singular neuter: omne
• genitive plural: omnium

So in this sentence, omnium does not mean just all by itself in an English-like way. It specifically means of all.

Because Latin has no definite article.

English says:

• the oldest

Latin simply says:

• veterrimus

The idea of the is understood from the superlative itself and the context.

That is very common in Latin. A beginner may want to translate word-for-word and expect an actual Latin word for the, but there isn’t one.

Because Latin word order is much more flexible than English word order.

English strongly prefers:

• This codex is the oldest of all.

Latin can place est at the end very naturally:

• Hic codex omnium veterrimus est.

This final position is especially common with forms of sum (to be), though not required.

So the sentence is not unusual or poetic just because est comes last. It is standard Latin style.

Both orders are possible in Latin.

The sentence as written places omnium before veterrimus, but Latin could also say:

• Hic codex veterrimus omnium est.

Since Latin marks grammatical relationships through endings more than through word order, the meaning stays the same.

Writers may choose one order or the other for emphasis, rhythm, or style. A learner should not assume that the first word automatically has the same syntactic role it would in English.

Normally here it means oldest, because it is a true superlative.

Latin superlatives can sometimes have an elative sense, meaning something like very or extremely, especially in the right context. But in this sentence the presence of omnium strongly points to a genuine superlative:

• omnium veterrimus = the oldest of all

So here very old of all would not make sense. The genitive omnium makes the comparison explicit.

Yes, they do.

All three are masculine nominative singular:

• hic — demonstrative adjective
• codex — noun
• veterrimus — adjective

That agreement is one of the main clues to the sentence structure.

A good way to read it is:

• hic codex = this codex
• veterrimus est = is the oldest
• omnium = of all

To a whole group.

A superlative like veterrimus usually identifies something as highest or lowest within a group. The group is expressed by omnium:

• of all

If Latin were just comparing two things, it would more naturally use a comparative adjective, such as older, rather than oldest.

So this sentence means the codex stands at the top of a larger set in terms of age.

A simple parsing would look like this:

• Hic — demonstrative adjective, nominative singular masculine, this
• codex — noun, nominative singular masculine, codex / book / manuscript
• omnium — genitive plural of omnis, of all
• veterrimus — superlative adjective, nominative singular masculine, oldest
• est — 3rd person singular present of sum, is

So structurally:

• subject: Hic codex
• predicate adjective: veterrimus
• verb: est
• partitive genitive with the superlative: omnium

That is the grammatical skeleton of the sentence.