Preston's Tower was constructed in the early 15th century, either by Sir Henry Preston or by his son-in-law Sir John Forbes, who inherited part of the Preston lands in 1420, following Sir Henry's death. His descendant William Forbes, 7th Laird of Tolquhon (died 1596), began work on a new castle in 1584, retaining the Preston Tower but adding new, more comfortable accommodation. He also improved the gardens and parkland around the house. King James VI was entertained at Tolquhon in 1589. The new buildings were arranged around a courtyard, and included an elaborate gatehouse, and a first-floor gallery. An inscription on the gatehouse records that "AL THIS WARKE EXCEP THE AULD TOWR WAS BEGUN BE WILLIAM FORBES 15 APRIL 1584 AND ENDIT BE HIM 20 OCTOBER 1589". The home of a "Renaissance man", To