No. 1,666 in Russian
петра
"Петра" is the genitive or accusative case of "Петро," a personal name equivalent to "Peter" in English.
In a sentence
Я посетил дом Петра в прошлом году.
I visited Peter's house last year.
In this sentence, 'Петра' is the genitive case of 'Пётр', used to show possession or association ('Peter's house').
День рождения Петра был вчера.
Peter's birthday was yesterday.
Here, 'Петра' is again the genitive case of 'Пётр', indicating possession ('Peter's birthday').
Я нашёл книгу Петра у входа.
I found Peter's book at the entrance.
Similarly, 'Петра' is in the genitive case of 'Пётр', used to express ownership or association ('Peter's book').
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