|Dowager Princess of Reuss|
Dowager Countess of Plauen
Lyngstad during the opening of ABBA: The Museum, 6 May 2013
Anni-Frid Synni, Dowager Princess Reuss of Plauen (German: Anni-Frid Synni, Prinzessin Reuß von Plauen; née Lyngstad, born 15 November 1945), commonly known as Frida Lyngstad (Norwegian: [ˈlyŋstɑ]; Swedish: [ˈlʏŋstɑːd]), or just by the mononym, Frida (Swedish: [²friːda]), is a Norwegian-born Swedish singer-songwriter, and environmentalist. She is best known as one of the lead singers of the Swedish pop band ABBA.