Iudex veritatem a reo poscit.

The subject is iudex.

You can tell because iudex is in the nominative singular, the case normally used for the subject of a finite verb. The verb poscit is also third person singular, so it matches a singular subject: the judge demands.

So the basic structure is:

• iudex = subject
• poscit = verb

Because veritatem is in the accusative singular, which marks the direct object here.

The direct object is the thing being demanded. In this sentence, the judge is demanding the truth, so veritatem has to be in the accusative.

Its dictionary form is veritas, and the accusative singular of this third-declension noun is veritatem.

So:

• veritas = truth
• veritatem = truth as the direct object

A reo means from the defendant or from the accused.

Here:

• a = from
• reo = ablative singular of reus

Latin often uses a/ab + ablative to show the person from whom something is asked, demanded, or taken. So a reo tells you the source: the judge demands the truth from the defendant.

Both a and ab are forms of the same preposition.

A simple rule is:

• ab is especially common before vowels
• a is common before consonants

Since reo begins with r, a consonant, a reo is perfectly normal.

So this is just the expected form before that word.

Poscit is:

• present tense
• active voice
• indicative mood
• third person singular

Its verb is posco, poscere, meaning to demand, ask for, or require.

So poscit means he/she/it demands. In this sentence, with iudex as the subject, it means the judge demands.

Because Classical Latin has no articles.

English uses the judge, the truth, a defendant, and so on, but Latin usually leaves that idea to context.

So:

• iudex can mean judge, a judge, or the judge
• veritatem can mean truth or the truth
• reus can mean a defendant or the defendant

The exact English article depends on the context and the sense of the sentence.

Yes, but not in the same way as in English.

Latin uses case endings more than word order to show grammatical function, so the order is more flexible. In this sentence, the endings already tell you what each word is doing:

• iudex = subject
• veritatem = direct object
• a reo = from the defendant
• poscit = verb

That means Latin could rearrange the words for emphasis without changing the core meaning. For example, Veritatem iudex a reo poscit would still mean the same thing.

The given order is a very natural Latin pattern, with the verb at the end.

Not necessarily.

In legal Latin, reus usually means the accused person or the defendant, not automatically someone proven guilty.

That is why English often translates it as defendant or accused, rather than guilty person.

So in this sentence, a reo is best understood as from the defendant.

A learner would normally look them up like this:

• iudex, iudicis = judge
• veritas, veritatis = truth
• reus, rei = defendant, accused person
• posco, poscere = demand, ask for

Those dictionary forms help you see how the sentence forms were built:

• iudex = nominative singular
• veritatem from veritas
• reo from reus
• poscit from posco

Yes, but poscit gives a particular nuance.

Posco is fairly strong: it suggests demanding, requiring, or calling for, not just politely asking.

So if the sentence uses poscit, it gives the judge a firm, authoritative tone. A different verb might suggest requesting, seeking, or asking in a weaker sense.

That makes poscit a very suitable legal or formal word here.