Princess Beatrix * Princess Margriet *Professor Pieter van Vollenhoven * Prince Constantijn of the Netherlands (Constantijn Christof Frederik Aschwin; born 11 October 1969) is the third and youngest son of the former Dutch queen, Beatrix, and her husband, Claus von Amsberg, and is the younger brother of the reigning Dutch king, Willem-Alexander.

His godparents are former King Constantine II of Greece (1940–2023), Prince Aschwin of Lippe-Biesterfeld, Axel Freiherr von dem Bussche-Streithorst, Max Kohnstamm, and Corinne de Beaufort-Sickinghe.

Prince Constantijn studied law at Leiden University, becoming a lawyer, and then worked at the Brussels department of the (Dutch) European Union commissioner of foreign relations, Hans van den Broek.

He spent a summer working for the International Finance Corporation (part of the World Bank Group) in Washington, DC.

The church wedding took place two days later on 19 May in the Grote of St Jacobskerk, with the Reverend Carel ter Linden officiating.