The main hall was fitted at this time, with plaster ceilings, stairs castle was of limestone and oak, and walls hung with art wallpaper full of gilt leather (leather wallpaper) and other materials.

Ekeby farm was donated to St. Clara monastery by King Magnus Ladulås in 1288, and in the early 15th century, the monastery's property also included Ösby farm and the island that is now called Gamla Djursholm and has become a peninsula due to land raising.

Information is found in old rhyming chronicles that he engaged in "piracy" and harbored pirates in his house on the islet who boarded ships that would deliver goods into Stockholm via the western side of Lidingölandet, but may also have been a right to levy customs duties.

For nearly 300 years, from the end of the 15th century until the mid-1770s, the entire Lidingön belonged to Djursholm's estate.

Lidingö came to belong to Djursholm through Ingeborg Larsdotter Tott, who in her second marriage married Councilor Nils Eskilsson (Banér) (1480–1520).