This is the 471st most frequent Russian word.
армении
"Армении" is the genitive or dative case of "Армения," meaning "of Armenia" or "to Armenia" in English.
In this sentence, 'Армении' is in the prepositional case, indicating location (in Armenia).
Я путешествовал в Армении прошлым летом.
I traveled in Armenia last summer.
Here, 'Армении' appears in the genitive case, denoting possession (the history of Armenia).
История Армении богата и разнообразна.
The history of Armenia is rich and diverse.
In this instance, 'Армении' is in the genitive case used after the preposition 'из' to indicate origin (from Armenia).