Before any of it there was Jernit, a small village that had stood here since the 1400s. It went in stages. In 1558 King Christian III ordered Jernit Parish merged into Hammel Parish, which meant Jernit Church had to come down. In 1583 the crown transferred the village itself to the nobleman Valdemar Parsberg, who demolished what was left of it and put up a manor of his own on a square moated earthwork in its place. He kept the name. For nearly a century the seat here was called Jernit, after a village that no longer existed and a church that had already been pulled down.

Mogens Friis bought Jernit in 1665. Seven years later, in April 1672, Christian V erected the county of Frijsenborg out of five separate estates and handed it to him — an act of royal arithmetic that produced, at its peak, something like 450 square kilometres of land, six thousand hartkorn of assessed value, and those forty-two parish churches. Hartkorn was the unit Denmark used to measure what land was worth rather than how much of it there was, which is the more honest way to describe a holding of this kind. The manor itself was rebuilt at the end of the seventeenth century and renamed for the family. What made the Frijs counts powerful was never the house.

Count Christian Emil Krag-Juel-Vind-Frijs took over the estate in 1849, modernised its operations, and sold off tenant farms on a large scale. From 1865 to 1870 he served as konseilspræsident — prime minister of Denmark — and it was in the middle of that tenure that the rebuilding happened. He hired Ferdinand Meldahl (1827–1908), who was simultaneously at work on Frederiksborg Castle, and between 1862 and 1867 Meldahl transformed the place. Three new wings went up, along with tall steepled towers, while the walls of the original ground floor were kept. A storey was added to the west wing and two-storey pavilions to the north and south. The whitewash came off and red brick with light stone banding and sandstone ornament went on. Otto Bache and Frederik Ludvig Storch handled the interiors. Contemporaries called it the most magnificently appointed home in Denmark, and it is still reckoned one of the country's finest examples of Renaissance Revival architecture.

In 1880 the count's son Mogens came back from England carrying the tastes of the English aristocracy, and he applied them thoroughly — palatial furnishings, elaborate decoration, an idea of what a great house was supposed to feel like from the inside. The exterior work continued too. Between 1891 and 1893 the working farm that had sat beside the castle was cleared away entirely, and roughly four hundred tønder land of that land was converted into an English-style park and a deer preserve. It is a revealing swap: productive ground turned into landscape, the farm moved out of sight so the house could have a view. Half a century earlier, that farmyard had been the reason the house existed.

Frijsenborg today runs to 6,181.8 hectares. The county title is long gone, but the land is still among the largest private holdings in Denmark. It has been in the hands of Bendt Tido Hannibal Wedell since 1982. The house is not open to the public and never really has been. You can see it from the road, which is the arrangement most Danish manors of this scale have settled into: visible, private, and quietly still in business after four hundred years of changing what that business is.