Etiam in tempestate spes pacis in mente imperatoris manet.

The subject is spes.

You can tell because spes is in the nominative singular, and the verb manet is also third person singular, so they agree:

• spes = hope
• manet = remains

So the basic core of the sentence is:

spes ... manet = hope remains

Pacis is the genitive singular of pax, pacis (peace).

It depends on spes and means hope of peace. Latin often uses the genitive in this way to show what a noun is connected with.

So:

• spes pacis = hope of peace

This is a very common construction in Latin. English sometimes uses of, and Latin often uses the genitive instead.

Because in with the ablative often means in, during, or in the midst of a place, state, or situation.

Here both phrases use in + ablative:

• in tempestate = in the storm / in troubled times
• in mente = in the mind

So although both use in, the meanings are slightly different because of context:

• in tempestate describes the situation or circumstances
• in mente imperatoris describes location in a more figurative sense: in the commander’s mind

Because the preposition in takes the ablative when it means in or on in a static sense, rather than movement into something.

So:

• in tempestate = in the storm
• not movement into the storm, but being within that situation

The noun is:

• tempestas, tempestatis = storm, disturbance, crisis
• ablative singular = tempestate

Imperatoris is genitive singular.

It goes with mente and means of the commander or of the general. So:

• in mente imperatoris = in the commander’s mind

This is another common Latin use of the genitive: showing possession or close association.

So literally, it is something like:

• in the mind of the commander

Manet is the third person singular present active indicative of maneo, manere, meaning remain, stay, or continue.

So here it means:

• remains
• continues to exist
• does not disappear

That fits well with spes:

• spes pacis ... manet = the hope of peace remains

Latin word order is much more flexible than English word order because Latin uses case endings to show how words function in the sentence.

English depends heavily on position:

• The hope remains in the commander’s mind

Latin does not need to keep that exact order, because the endings already show the grammar:

• spes = subject
• pacis = genitive
• mente = ablative
• imperatoris = genitive
• manet = verb

So Etiam in tempestate spes pacis in mente imperatoris manet is perfectly normal Latin.

Also, Latin often puts the verb at the end, and it often places important ideas early for emphasis. Here Etiam in tempestate gives emphasis to the idea that even in a storm / even in crisis, hope still remains.

Etiam usually means also, even, or still, depending on context.

In this sentence it most naturally gives emphasis:

• even in a storm
• even in troubled times

So etiam strengthens the statement. It tells us that the hope of peace remains despite difficult circumstances.

No. Tempestas can mean a literal storm, but it can also mean a time of trouble, turmoil, or crisis.

So in tempestate could mean:

• in a storm literally
• or more figuratively in a time of crisis

Latin often uses weather words metaphorically, just as English does.

That depends on context.

The word imperator originally means a commander or military leader. In later historical contexts it can also be translated as emperor.

So in this sentence:

• imperatoris could mean of the commander
• or of the general
• or, in a later imperial context, of the emperor

Without more context, commander or general is often the safest grammatical explanation.

Spes is a fifth-declension noun.

Its dictionary form is:

• spes, spei = hope

Some important forms are:

• nominative singular: spes
• genitive singular: spei
• accusative singular: spem
• ablative singular: spe

So in this sentence spes is nominative singular and acts as the subject.

Yes, that is often a good learning strategy.

A more straightforward order would be:

Spes pacis manet in mente imperatoris etiam in tempestate.

Or even more literally for analysis:

• spes = hope
• pacis = of peace
• manet = remains
• in mente imperatoris = in the commander’s mind
• etiam in tempestate = even in the storm / even in crisis

So you can first identify the grammatical pieces, then fit them into natural English. This is a very useful habit when reading Latin.