Matthew 27:37

Καὶ ἐπέθηκαν ἐπάνω τῆς κεφαλῆς αὐτοῦ τὴν αἰτίαν αὐτοῦ γεγραμμένην·οὗτός ἐστιν Ἰησοῦς ὁ βασιλεὺς τῶν Ἰουδαίων

And they placed above his head his charge written this is Jesus the King of the Jews


 * γεγραμμένην - perfect passive participle accusative singular feminine. It modifies τὴν αἰτίαν, gives more information about "the charge". τὴν αἰτίαν is feminine accusative singular, so the participle agrees with it.