Isen Abbey was a Benedictine abbey, later a collegiate foundation. Dedicated to Saint Zeno of Verona, the abbey was founded by members of the Fagana family, an indigenous Bavarian noble clan, and by Bishop Joseph of Freising (also known as Joseph of Verona) in the 8th century, about 752. It was one of the oldest monasteries on ancient Bavarian soil. Until the beginning of the 12th century it was Benedictine, but afterwards became a collegiate foundation.
It was dissolved during the secularisation of Bavaria in 1802. The premises and the abbey's seven farms passed into private ownership, while St. Zeno's church, with a house for the priest, became the parish church of Isen.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.