 Prince Constantijn was born on 11 October 1969 at (now the University Medical Center Utrecht) in Utrecht, following the births of his brothers, Willem-Alexander (born in 1967), and Johan Friso (1968–2013).He goes by the nickname "Tijn".His godparents are former King Constantine II of Greece, Prince Aschwin of Lippe-Biesterfeld, Axel Freiherr von dem Bussche-Streithorst, Max Kohnstamm, and Corinne de Beaufort-Sickinghe.