Ex omnibus templis hoc templum pulcherrimum est.

In Latin, a superlative like pulcherrimum can be followed by ex or de plus the ablative to mean out of all or of all.

So:

• ex omnibus templis = out of all the temples
• hoc templum pulcherrimum est = this temple is the most beautiful

Put together, the phrase means that this temple stands out from the whole group of temples.

They are in different cases and numbers.

• templis = ablative plural, used after ex
• templum = nominative singular, the subject of the sentence

So:

• ex omnibus templis = from/out of all the temples
• hoc templum = this temple

Latin changes noun endings depending on the noun’s job in the sentence.

Omnibus is ablative plural, because it agrees with templis, which is also ablative plural after ex.

The adjective omnis, omne means all or every, and adjectives in Latin must agree with the nouns they describe in:

• gender
• number
• case

Since templis is neuter, plural, ablative, omnibus must also be neuter, plural, ablative.

Hoc means this, and it is the neuter nominative singular form of the demonstrative hic, haec, hoc.

It is hoc because it modifies templum, and templum is:

• neuter
• singular
• nominative

So hoc templum means this temple.

If the noun were masculine, you would expect hic. If feminine, haec.

Because it agrees with templum.

In this sentence, pulcherrimum is a predicate adjective with est, and predicate adjectives still agree with the noun they describe.

Since templum is:

• nominative
• singular
• neuter

pulcherrimum must also be:

• nominative
• singular
• neuter

So hoc templum pulcherrimum est means this temple is most beautiful.

Pulcherrimum is the superlative of pulcher, meaning beautiful.

A very common superlative ending in Latin is -issimus, -issima, -issimum, but adjectives ending in -er often form the superlative with -rimus added to the stem.

So:

• pulcher = beautiful
• pulchrior = more beautiful
• pulcherrimus / pulcherrima / pulcherrimum = most beautiful

This is why you get pulcherrimum, not pulchrissimum.

Because the sentence is not comparing just two things. It is saying that one temple is at the top of a whole group.

• comparative = more beautiful
• superlative = most beautiful

Since the phrase ex omnibus templis means out of all the temples, the superlative is the natural choice.

In many contexts, Latin can omit est if the meaning is clear, especially in poetry or informal phrasing. But in a basic prose sentence like this, est is completely normal and expected.

So:

• hoc templum pulcherrimum est = standard full sentence
• hoc templum pulcherrimum might also be understandable in some contexts, but it is less explicit

For learners, it is best to treat est as an important part of the sentence.

Latin word order is much more flexible than English word order because the endings show the grammatical relationships.

This sentence begins with ex omnibus templis, which puts the larger group first: out of all the temples. Then it gives the subject: hoc templum. Finally it ends with pulcherrimum est.

A Roman could also say things like:

• Hoc templum ex omnibus templis pulcherrimum est
• Pulcherrimum ex omnibus templis hoc templum est

These can all mean the same basic thing, though the emphasis may shift. The given order highlights the comparison first.

Yes, Latin can use either ex or de with a superlative to express of all or out of all.

So both of these are possible in Latin:

• ex omnibus templis
• de omnibus templis

Both can mean of all the temples. In many learning texts, ex is introduced first because it clearly suggests out of the group.

The sentence breaks down like this:

• ex omnibus templis = prepositional phrase giving the group being considered
• hoc templum = subject
• pulcherrimum = predicate adjective
• est = verb

So the structure is essentially:

Out of all the temples, this temple is the most beautiful.

That is a very common Latin pattern: [group in ex/de + ablative] + [subject] + [superlative] + est