
1) Free imperial city 2) Populated place on the Rhine
Found on
https://www.crosswordclues.com/clue/konstanz

Konstanz (pron, locally [ˈkɔnʃtants]; English: constance, Latin: Constantia) is a university city with approximately 80,000 inhabitants located at the western end of Lake Constance in the south-west corner of Germany, bordering Switzerland. The city houses the University of Konstanz and was for more than 1200 years residence of the Roman-Cathol...
Found on
http://en.wikipedia.org/wiki/Konstanz

The Konstanz is a German Troika Class minesweeper of 465 tons displacement commissioned in 1959. She is powered by two MD 871 UM/ID diesels providing a top speed of 16.5 knots and a range of 850 miles. She is manned by a crew of 44 including five officers and was armed with one Bofors 40 mm/70 anti-aircraft gun.
Found on
http://www.probertencyclopaedia.com/browse/RK.HTM
No exact match found.