On May 11, 2012, His Royal Highness Grand Duke Henri of Luxembourg held an audience with representatives from the United Nations at the Grand Ducal palace. These representatives are participating in a seminar entitled, ‘Diplomacy, Development and Defense: The Importance of a Holistic Approach to the Maintenance of Peace and International Security’ according to the Cour Grand-Ducale de Luxembourg.
Meanwhile, Her Royal Highness Princess Caroline of Hanover was in Baden-Baden, Germany on May 11, 2012, to celebrate the 900th anniversary of the Margraviate of Baden (became a Grand Duchy in 1806-1918.) According to a press release regarding the celebrations, the House of Baden is:
… the oldest and influential in German history and has influenced greatly both Baden-Württemberg and Baden.
Again and again the House Baden remained throughout its history with major challenges, threats, even before the end. And, time and again the house has managed to survive.
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Sources: Cour Grand-Ducale de Luxembourg and Presse Stammhaus Montfort