Siatista () is a town and a former municipality in Kozani regional unit, Western Macedonia, Greece. Since the 2011 local government reform it is part of the municipality Voio, of which it is the seat and a municipal unit. It lies southwest of Kozani. The municipal unit has an area of 158.524 km2, the community 94.426 km2. The 2011 Greek census recorded 5,490 residents in the town and 6,247 in the municipal unit. It was built on the austral slope of the Velia mountain on an (average) height of . Administrative division The municipal unit of Siatista consists of the following municipal communities (populations as of 2011): Siatista, population 5,490 Mikrokastro, population 446 Palaiokastro, population 311 The municipal community of Palaiokastro comprises two settlements: Palaiokastro and Dafnero. History The first name of the city was Kalyvia. This name is referenced in the archives of the Zavordas Monastery. In 1745, the city is referenced in a formal document of Joseph, Archbishop of Ohrid. The commercial ties between Siatista and Central Europe during 17th and 18th centuries were very successful, and allowed the inhabitants to build many mansions and churches with wonderful frescos and icons. Siatista lies in a unique setting where its mountains and wilderness provide a strong sense of solitude. As a result, many Siatistan had to become merchants as to import (or export) necessary goods. Many of them found their way abroad permanently or temporarily where they distinguished themselves as able and reliable merchants. Many of them who became wealthy never return in their town staying for ever in the big cities all over the Balkan Peninsula. Those who choose to return built large and elegant mansions distinguished by their thick walls, imposing doors, lavishly decorated "ondas", gorgeous stained glasses, and lively colours in the folk paintings on their walls. All of this embodies their high standard of living, a rather rare phenomenon for such an isolated town. Many of those mansions are still in good shape today in the old city. One of such a self-made wealthy merchants was Theodoros Dimitriou who together with his wife Afrati left their town at 1790 for Zagreb, then an Austrian city. He managed to earn a significant fortune by trading a variety of goods which helped them to give a proper education to their children. Of them, Dimitrios destined to become a famous and celebrated personality for his role as a