Ernst August Prince of Hanover failed in Austria with an appeal against a judgment of the regional court in Wels.
The Linz Higher Regional Court confirmed the ten-month suspended sentence imposed on the 67-year-old on Wednesday.
The district court had taken it as proven that Ernst August attacked police officers while he was in a state of intoxication and severely threatened an administrator couple working on his property.
Ernst August himself did not appear at the trial date.
He wanted to avoid "another media spectacle", he informed the court.
His lawyer also stated that his client was a high-risk patient and wanted to avoid crowds of people indoors due to corona.
His health has improved a lot.
"He wants to have his peace and quiet and dedicate himself to his recovery."