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 is a lineage within the Danish royal family, tracing back to the House of Glücksburg. When they took control, they replaced the House of Wittelsbach, who had governed Greece from 1832 to 1862.