Siadehan or Siaden also known as Takestan is a city in and the capital of Takestan County, in Qazvin Province, Iran.
Most of its 75,000 or so people are Tats and make their livings through agricultural activities, including the production of many different grapes, peaches, nectarines, hay, wheat and cucumbers. During the reign of reform oriented Rezā Shāh Pahlavi, the city’s name, then Syadehen, was changed to Takestan, which means as much as “a place of vine-yards”.
The Pir mausoleum, alternatively known as Pir-e Takestan and Imamzadeh Pir, is a small, domed building dating from the Seljuq-era 11th century and has since been restored. Only little of the original ornamental decorations remains.