How did the military rank of Lieutenant come into existance and why?

Question

How did the military rank of Lieutenant come into existance and why?

Answer 1

There is a distinct origin of the word Lieutenant.

The first part: Lieu, denotes the meaning of "in lieu" or "in place of"

The second part: Tenant, comes from the part of the definition which refers to "one who holds an office"

So essentially Lieutenant means "in place of the one who holds an office." To a captain or a major, the lieutenant is supposed to be their right hand, filling in minor leadership roles and stepping up to cover when the flight commander is otherwise occupied.

Answer 2

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Answer 3

I don't know the history of it, but just thinking logically:

Sergeants manage the enlisted men on day to day things.

Captains usually run a company of soldiers

They needed an intermediary so that the captain isn't bothered with lots of small issues. Also, they would need a kind of training ground for future captains, to test their leadership abilities.

Answer 4

Other than the fact that it is French in origin I can't tell you much more than that.

In the army, air force and marines:
2nd Lt
1st Lt.

Navy:
Ensign
Lt. jg (junior grade)
Lt.