The monastery at Dragsmark, also known as "Marieskog" in Norwegian,[1] was founded some time before 1260,[2] with the support of King Håkon Håkonsson, and was dedicated to the Blessed Virgin Mary.

The abbey was very wealthy in its heyday and ran a prestigious school, but declined during the 15th century, and as early as 1519 was in the control of a lay administrator, the first monastery in Norway to be secularised.

With the Reformation the Crown granted it to a tenant in 1532, with a condition that the remaining canons had to be maintained.

The buildings fell into disrepair, and in 1610 were used as a quarry for stone for the construction of Båhus Fortress.

The monastery ruins are on the west of Bokenäset on the fjord between Uddevalla and the sea, north of the island of Orust.