In the autumn of 1575, a year after the relief of Leiden, Rembrandt's grandmother bought a corn windmill from Jan van der Does, lord of Noordwijk. The mill was transported from Noordwijk to Leiden and built on top of the city walls, just next to the White Gate. It was named the Rhine after the river running close by. The Rhine was a post mill type. Post mills were the earliest type of European windmills and common in the Netherlands during the 16th and 17th centuries. Because the mill could be turned into the wind, the design maximized its efficiency in harnessing wind power. In 1644, the city ordered to move the mill a bit further - most likely to rebuild the defense walls.