Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Finnish gunboat Klas Horn - Klas Horn (ex-Posadnik) was the flagship and an escort ship for the Russian Czar's yacht. Posadnik was built in Prussia in 1892 for the Montenegrin king Nicholas I. The ship was purchased by the Russian Czar after Nicholas' money ran out. After the Russian revolution the ship was taken over by the Finnish Navy and renamed Klas Horn after a 16th-century admiral. She initially served as a minelayer but was rebuilt into a gunboat in the 1920s.
The answer to this question is:
Mean Of Transportation