 In September 1947, the entire valley was transferred to Yugoslavia, with the sole exception of the village of Savogna d'Isonzo (), which remained in Italy.During Slovenia's Ten-Day War for independence, the valley was the theater of fighting between the Yugoslav People's Army and the Slovenian military, which involved local inhabitants who spontaneously aided the Slovenian forces by putting up improvised roadblocks preventing the advance of Yugoslav federal troops.Prominent people who were born or lived in the region include the painters Zoran Mušič and Veno Pilon, the poets Stanko Vuk, Simon Gregorčič, Nevin Birsa, and Josip Murn, the diplomat and writer Sigismund von Herberstein, the historian Martin Baučer, the preachers Sebastijan Krelj and Tobia Lionelli, the composer of the music for the Slovenian national anthem Stanko Premrl, the Partisan hero Janko Premrl, the author Danilo Lokar, the literary historian Avgust Žigon, and the designer Oskar Kogoj.