Building commenced in 1563. The palace used to be the residence of the Counts of Ems (their marriage policy lead to them being related to the Medici) and, along with Glopper castle and Alt-Ems castle ruins, is still privately owned. Of special mention regarding the history of the palace is the discovery of manuscripts A and C of the Niebelungenlied (the song of the Nibelungs).
https://www.bodensee-vorarlberg.com/en/poi/renaissance-palast-hohenems/