He was in 1436 succeeded by his son, Jens Tetz Rosengaard, and from then on the estate was frequently referred to as Rosengaarden after him.

In 1662, Lellinge was granted to supervisor of the royal kitchen (køkkenskriver) Hans Olufsen, Abel Cathrine's husband, as payment for an old debt.

Luxdorph expanded the estate to 200 tønder hartkorn and in 1693 unsuccessfully tried to convert it into a manor.

Luddorph's daughter, Hedevig Ulrikke, in 1713 brought Rosengaard into her marriage with Adam Christoffer Knuth.

After the death of his first wife, Knuth married a second time to Ide Margrethe Reventlow.

In 1743, she converted Rosengaard, Sørupgaard and Sandbygaard into the Barony of Conradsborg for her son Conrad Ditlev Knuth.