"De Alde Friezen" is the anthem of the Friesland province of the Netherlands.
The text is by the Frisian writer Eeltsje Halbertsma. The version commonly sung today is an abridgement, dating from 1876, by Jacobus van Loon. Wikipedia
Composer: Heinrich Christian Schnoor
Lyricist: Eeltsje Hiddes Halbertsma