Conversation so far:
Was Prince Bernhard of Lippe-Biesterfeld married?
they were married at The Hague on 7 January 1937.
Who was he married to?
Princess Juliana.
Did they have any children?
Prince Bernhard was father of six children.
Did either him or Juliana have children outside of the marriage?
He had two illegitimate daughters.

Question: Where they conceived before his marriage to Princess Juliana?
Self-contained rewrite: Where Prince Bernhard of Lippe-Biesterfeld' two illegitimate daughters conceived before his marriage to Princess Juliana?