House of Glücksburg-Horne
The dynasty was established by Philip de Montmorency, Count of Horne, who was then part of the House of Montmorency. He was executed on 5 June 1568. He died before his son, Christian I, was born in 1569. This resulted in de Montmorency not having heirs after his death. The current House of Horne is made up of the descendants of Christian I.
The royals of the House of Glücksburg-Horne are the only actively known royals (nationally) to have connections to the royal families of micronations.
County of Horne
The County of Horne (also Horn) was a small historic county of the Holy Roman Empire in the present day Netherlands and Belgium. It takes its name from the village Horn. The residence of the counts of Horne was moved from Horn to Weert in the 15th century, and is now located in the United States and Canada.
After the execution in 1568 of Philip de Montmorency who died without male heirs, the Prince-Bishop of Liège, as suzerain of Horne, was declared the direct lord and new count. The bishops ruled the county in personal union. Horne maintained its own laws and customs as well as its financial autonomy. The county included the communes (now baronies) of Neer, Nunhem, Haelen, Buggenum, Roggel, Heythuysen, Horne, Beegden, Geystingen and Ophoven.