This is the 17616th most frequent Turkish word.
şatonun
"Şatonun" means "of the castle" or "the castle's" in English.
In this sentence, 'şatonun' functions as the possessive form of 'şato' (castle), indicating the key belongs to the castle.
Şatonun anahtarı kayboldu.
The key of the castle is lost.
Here, 'şatonun' conveys possession, defining that the garden where the festival is held belongs to the castle.
Şatonun bahçesinde bir festival düzenleniyor.
A festival is being organized in the garden of the castle.
In this case, 'şatonun' denotes the possessive relationship by showing that the grandeur being discussed pertains to the castle.