Deioces, Diyako or Deiokes (Greek Δηιόκης) was the first king of the Medes

Medes

The MedesThe Medes...

 according to Herodotus

Herodotus

Herodotus was an ancient Greek historian who was born in Halicarnassus, Caria and lived in the 5th century BC . He has been called the "Father of History", and was the first historian known to collect his materials systematically, test their accuracy to a certain extent and arrange them in a...

. In the late 8th century BC there was a Daiukku or Dayukku who was a Mannaean

Mannaeans

The Mannaeans were an ancient people who lived in the territory of present-day Iran and Azerbaijan, around the 10th to 7th centuries BC...

 provincial governor. Perhaps Herodotus uses the name in error.
Herodotus (I: 96ff) says that Deioces, father of Phraortes, was "a man of great ability and ambitious for power" in a time when there was no government in the region; people in his own and other villages chose him to arbitrate disputes, and eventually selected him as their king: "Let us appoint one of our number to rule us so that we can get on with our work under orderly government, and not lose our homes altogether in the present chaos." They built him first a palace and then a capital, Ecbatana

Ecbatana

Ecbatana is supposed to be the capital of Astyages , which was taken by the Persian emperor Cyrus the Great in the sixth year of Nabonidus...

 (modern Hamadan

Hamadan

-Culture:Hamadan is home to many poets and cultural celebrities. The city is also said to be among the world's oldest continuously inhabited cities.Handicrafts: Hamadan has always been well known for handicrafts like leather, ceramic, and beautiful carpets....

).