This is the 14491st most frequent Russian word.
павшего
"Павшего" means "fallen" (referring to someone or something that has fallen, often used in a figurative or solemn context).
Here, 'павшего' is used as a participle in the genitive case to describe the soldier who fell in battle.
Мы посетили могилу павшего солдата.
We visited the grave of the fallen soldier.
In this sentence, 'павшему' is used as a participle in the dative case referring to the hero who has fallen.
Это памятник павшему герою.
This is a monument to the fallen hero.
Here, 'павшего' is used as a participle in the genitive case to describe the kingdom that has fallen.