The family is a branch of the Danish royal family, itself a branch of the House of Glücksburg. Upon its accession to power, It replaced the House of Wittelsbach that previously ruled Greece from 1832 to 1862.
The royal family took over the Greek throne from the House of Wittelsbach, which had ruled Greece from 1832 to 1862. The Danish royal family is a branch of the larger House of Glücksburg.