The House of Hohenzollern in Germany. The Habsburgs formally gave up their claim in order to create the Austro-Hungarian alliance/Empire, but they had asserted it less than a generation prior and also claimed their Empire status on that back of it. And in the Ottoman Empire the lineage of Mehmed, including Mehmed V during WWI, claimed to be the continuation of the Byzantine / Eastern Roman Empire.
The House of Hohenzollern in Germany. The Habsburgs formally gave up their claim in order to create the Austro-Hungarian alliance/Empire, but they had asserted it less than a generation prior and also claimed their Empire status on that back of it. And in the Ottoman Empire the lineage of Mehmed, including Mehmed V during WWI, claimed to be the continuation of the Byzantine / Eastern Roman Empire.