He was born in Berlin the eldest son of Karl Biron, Prince of Courland (1907-1982) and Princess Herzeleide of Prussia (1918-1989), the daughter of Prince Oskar of Prussia, a son of Emperor William II) and Duchess Augusta Victoria of Schleswig-Holstein.
Prince Ernst-Johann succeeded his father as head of the Biron family following his death on 28 February 1982. He is in line to the British throne through his descent from Queen Victoria"s daughter, Victoria, Princess Royal. Prince Ernst-Johann was married to Countess Elisabeth Victoria Raimonda zu Ysenburg-Büdingen in Philippseich (born 1941) in Munich in a civil ceremony on 14 August 1967, and in a religious one the next day.
The couple have two adopted daughters:
Anja Prinzessin Biron von Curland (born 25 January 1975).
Christiana Prinzessin Biron von Curland (born 23 May 1977).
