Konstantin was born in Munich, Bavaria. He was the eldest son of Prince Adalbert of Bavaria and his wife Countess Auguste von Seefried auf Buttenheim. In 1939, as most young German men of his age, the Prince was drafted to the military. However, his career in the German Army was short lived. In 1941, Prince Konstantin was relieved from all combat duties as a result of the so called Prinzenerlass and a year later started studying law at Albert-Ludwigs-Universität in Freiburg im Breisgau. After his graduation in 1944, he worked at the Higher Regional Court of Karlsruhe, but was arrested, as were most of his relatives, after the failed attempt to assassinate Adolf Hitler and remained imprisoned for the rest of World War II.
Post World War II
After the war, Prince Konstantin began working as a journalist at the Neu Revue magazine Süddeutsche Zeitung and later on for the popular German magazine Bunte. In addition, in 1958 he published a biography of Pope Pius XII entitled Der Papst and three years later a historical reference book Ohne Macht und Herrlichkeit. He also became a member of the Christlich-Soziale Union in Bayern, one of the biggest political parties in Bavaria and was elected to the Bavarian state parliament in 1962 and in 1965 to the Bundestag.
Marriage
On 26 August 1942 Prince Konstantin married Princess Maria Adelgunde of Hohenzollern-Sigmaringen, the daughter of Prince Friedrich von Hohenzollern-Sigmaringen and Princess Margarete Karola of Saxony. The wedding in Sigmaringen has been described as "the biggest society event during the war". According to a contemporary, "a score of photographers and newsreel cameramen" were present at the procession from the castle. The couple had two sons, but the marriage ended in divorce on 14 July 1948 and was annulled on 24 March 1950.
Prince Leopold Rupprecht Ludwig Ferdinand Adalbert Friedrich Maria et omnes sancti of Bavaria he married Ursula Mohlenkamp on 21 October 1977. They have four children and six grandchildren.
Prince Adalbert Friedrich Johannes Maria et omnes sancti of Bavaria he married Marion Malkowski on 9 May 1978 and they were divorced on 11 November 1983. He remarried Sandra Burghardt on 21 February 1986. They have two children.
On 14 August 1953 Prince Konstantin married again, Countess Helene von Khevenhüller-Metsch, the daughter of Count Franz von Khevenhüller-Metsch and Princess Anna von Fürstenberg. The civil ceremony took place at Sankt Georgen am Längsee in Carinthia and the religious wedding followed a day later at Hohenosterwitz. The couple had a daughter together.
Princess Ysabel Helene Anna Augusta Maria de la Paz Ludovica-Fernanda et omnes sancti of Bavaria she married Count Alfred Hoyos on 30 May 1976. They have two children and five grandchildren:
*Countess Stephanie Hoyos she married Baron Franz von Brackel on 15 April 2006. They have three children:
**Count Constantin von Brackel
**Countess Antonia von Brackel
**Countess Johanna von Brackel
*Count Johannes Hoyos he married Veronica Wundsam in 2013. They have two sons:
