This is the 2802nd most frequent Russian word.
псковом
"Псковом" is the prepositional case of "Псков," meaning "in/from Pskov," referring to the city of Pskov.
The word 'псковом' is used as an adjective form relating to the city of Pskov, indicating that the 'city' belongs to or is associated with Pskov.
Я жил в Псковом городе десять лет.
I lived in the city of Pskov for ten years.
Here, 'псковом' describes the museum, specifying its location or affiliation to Pskov.
В Псковом музее есть удивительные экспонаты.
In the Pskov museum, there are amazing exhibits.
In this sentence, 'псковом' relates to the historical event, indicating its connection to the city of Pskov.