Ernst-Johann Karl Oskar Eitel-Friedrich Peter Burchard, Prince Biron von Courland (born 6 August 1940) is the senior male-line descendant of Ernst Johann von Biron, and as such heir to the Duchy of Courland and Semigallia.
He was born in Berlin, the eldest son of Karl, Prince Biron 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 Augusta Viktoria of Schleswig-Holstein.Prince Ernst-Johann succeeded his father as head of the Biron family following his death on 28 February 1982.
He is also a Knight of Justice (and, since 2008, an honorary commander in the Commandery of Silesia) of the Johanniterorden ("Johannine Order"), to which he was admitted in 1940 and whose grand master is his cousin Prince Oskar of Prussia (Prince Ernst-Johann's uncles and grandfather had headed the Order throughout most of the twentieth century).
He is in line to the British throne through his descent from Queen Victoria's daughter, Victoria, Princess Royal.