Princess Marie-Esméralda of Belgium, Lady Moncada, is a member of the Belgian royal family. She is the half-aunt of King Philippe of Belgium and Henri, Grand Duke of Luxembourg. Princess Marie-Esméralda is a journalist, author and documentary-maker. She is also an environmental activist and a campaigner for women's rights and indigenous people's rights.

Belgium is a constitutional, hereditary and popular monarchy. The monarch is titled King of the Belgians and serves as the country's head of state and commander-in-chief of the Belgian Armed Forces. There have been seven Belgian monarchs since independence in 1830.