Tatoi was the summer palace and 42 km2 estate of the former Greek royal family. The area is a densely wooded southeast-facing slope of Mount Parnitha, and its ancient and current official name is Dekeleia. It is located 27 km (17 mi) from the city centre of Athens and 2.5 km (2 mi) from Kifissia.

The currently deposed Greek royal family was the ruling family of the Kingdom of Greece from 1863 to 1924 and again from 1935 to 1973. 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 first monarch was George I of Greece, the second son of King Christian IX of Denmark. The current head of the family is Pavlos, who assumed the role upon the death of his father, former King Constantine II on 10 January 2023.