Antiquities from the prehistoric to the Byzantine period have been unearthed in many sectors of the city. In the east part of Kozani, an ancient necropolis has been found, dating to the early Iron Age.
During Philip II of Macedon's reign, the region was named Elimeia, which was part of Upper Macedonia and probably in the same place there was a town named Tyrissa. In the south-west of the modern city, on Siopoto hill, there was a settlement named Kalyvia, between 1100 and 1300, traces of which are still preserved.
Kozani was probably founded by Christian settlers who, after the Ottoman conquest, withdrew from the plains of Macedonia into the mountains, during the 14th and 15th centuries.
Its secure position soon attracted other Christians expelled from Epirus, in 1392. Together with the settlers from Epirus, many cattle-breeders moved in the region.
The first recorded mention of Kozani is in an Ottoman register of 1528, as a settlement with 91 houses, 23 singles and 15 widows.
One of the most important colonizers of Kozani was the chief shepherd Ioannis Trantas, who settled about 100 families. His son, Charisios Trantas, managed to obtain a Sultan's firman in 1664, according to the terms of which the town came under the protection of the Sultan's mother, was endowed with many privileges, and became forbidden for the Turks to settle in.
In 1664, the magnificent church of Agios Nikolaos was built. In 1668, the library and the famous school of Kozani were founded.
During the 17th and 18th century, commercial relations with the countries of central Europe gave the opportunity for the city to flourish economically.
During the 19th century, as foreign travellers relate, the population of the town was Greek, and was growing.
The town's growth was disrupted in 1770, because of conflict that erupted between Kozani's local inhabitants and Kozanite merchants in central Europe, who contributed to the town's prosperity; even more catastrophically, the city was pillaged by Turkish beys in 1770.
A subsequent incursion by Aslan bey, in 1830, ravaged the city immensely.
In 1855 next to St. Nicholas Church a 26 meters high bell tower was built, which would become the symbol of the city.
In the late 19th and early 20th century, Kozani was part of the Manastir Vilayet of the Ottoman Empire.
The Greek army entered Kozani on 11 October 1912, during the First Balkan War, after its victory against the Ottoman army in the Battle of Sarantaporo.
By this time, the population of the town was 12,000 Orthodox Greeks.
In 1923, during the population exchange between Greece and Turkey, about 1,400 Greek families from Pontus and Asia Minor were settled in Kozani.
In the 20th century, the city grew tremendously, as lignite reserves in the area started being used by Public Power Corporation, making Kozani the foremost producer of electrical power in Greece. An earthquake that occurred in the region on 13 May 1995, with a magnitude of 6.6 on the Richter scale caused only property damage.
The city now combines modern with old faries architecture.
Some magnificent buildings are the clock tower, the town hall, the folklore museum, the "Valtadoreio" Gymnasium, the National Bank of Greece building, the "Ermioneion" Hotel and the mansions of Georgios Lassanis and Grigorios Vourkas.
The Municipal Library of Kozani called "Kovendareios" is the second biggest in Greece, and it has 150,000 books, rare publications, valuable documents, and one of the rare copies of Rigas Feraios' charter.
For this reason Kozani was included in the National Cultural Network of Cities with object the promotion of the Book and Reading. The Institute of Book and Reading was established and Kozani is now known as City of Books.
Today Kozani is the administrative, commercial, economic, and transport centre of the region of West Macedonia.
Source: www.wikipedia.org