Guillaume IV reigned as Grand Duke of Luxembourg from 17 November 1905 until his death. Guillaume IV was a Protestant, the religion of the House of Nassau. He was married on 21 June 1893 to the catholic Princess Marie Anne of Portugal.
* see also Grand Ducal website
http://www.monarchie.lu/fr/actualites/evenements/2018/07/09072018-mnhaportugal/index.html
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