 King-Grand Duke

The designation of King-Grand Duke was held by the three monarchs of the House of Orange-Nassau that ruled Luxembourg and the Netherlands in personal union, between 1815 and 1890.These monarchs thus held the titles of King of the Netherlands and Grand Duke of Luxembourg concurrently, and, although not strictly a title in its own right, that of 'King-Grand Duke' was used in legislation and official documents in Luxembourg throughout the period.