Maxima, the Argentine princess, according to her biographer On April 30th, Prince Willem of Orange will be crowned King of the Netherlands, after his mother Queen Beatrix's recent abdication. That makes his Argentine wife Maxima Queen - a source of pride for Argentines, but also potentially very controversial, as her father was a cabinet minister during the Dirty War, in which thousands of Argentines were tortured and killed. Images and soundbites.