From Siuntio's Suitia Erik Fleming bought in 1540 from village Karnainen 7 domains, which were merged 1644.
1540-1638 Suitia's Manor owned by genus of Fleming.
1638-1643 Per Banér, 1644-1660 Klas Banér, 1661-1676 Nils Skunck, 1677- 1680 Karl Skunck,
1681-1695 Ebba Christina de la Chapelle.
Swedish nobility, did not live at Koivula.
The manor was called “Court”.
1712-1744 Hans Jürgen Dahl, a sergeant major.
1734 the domain appointed Koivula ( a Finnish word koivu means in english birch tree and Koivula is proper noun derived from the word koivu ( birch ) which can mean a place where there is a lots of birch trees.)
1745-1822 The offspring of Dahl.
1823-1872 Berndt Wilhelm Nordberg, a surveyor.
Participated in community causes, but objected to the establishment of municipal government in the 1860s.
Named Manor as Wilhelmsdal in the 1830s.
Gustavian main building, built in 1832.
1873-1874 Gabriel Wilhelm Nordberg, a surveyor, previous owner's son.
1875-1877 Ivar Heribert Hannelius, a surveyor, previous owner's son.
1877-1892 Johan Fredrik Forsström, a churchwarden.
Work in numerous positions of trust, inter alia, the municipal board (local board) Chairman.
1868-1892 and as churchwarden 1871-1892.
1898-1918 Oskar Teodor Forsström (Karnakoski).
Changed his last name from Swedish to Finnish name 1900.