The story
Raseborg as a municipal name is a new coinage, but the castle of Raseborg was first mentioned in 1378 as Rasaborge. It acted as the center of the Raseborg slottslän (Finnish: linnalääni) covering western Uusimaa and some parts of Finland Proper such as Kisko.
The area of the modern municipality had eight municipalities at its peak: Ekenäs, Ekenäs landskommun, Snappertuna, Karis, Karis landskommun, Pohja, Tenala and Bromarv. The first merger in the area happened in 1969, when Karis landskommun was merged into Karis. By 2008, only Ekenäs, Pohja and Karis were independent municipalities, forming the modern Raseborg municipality in 2009.
From Wikipedia’s article on Raseborg, shared under CC BY-SA 4.0.5
