As the second emperor of my country, my reign was four times as long as that of the previous emperor. They remember me unkindly in the country where I ruled, but a battleship named for me in the land of my birth was famously successful.
HiHi
? Kaiser Wilhelm II
All the Best
Peter
? Kaiser Wilhelm II
Negative. Hint: some countries have had more emperors than people think.
Franz Joseph I of Austria
HiHi
Maths ain't my strong point but lets try George V reigned 1910 1936, his predicesor Edward reigned 1901 1910, the Battleship George V in on the Bismark kill. Oh and just to be safe Victoria was an Empress
All the Best
Peter
Franz Joseph I of Austria
No. If there was a notably successful warship named after him I am unaware.
....let's try George V reigned 1910 1936, his predicesor Edward reigned 1901 1910, the Battleship George V in on the Bismark kill. Oh and just to be safe Victoria was an Empress
Does not meet the "four times" requirement, and only incorrigible unromantic anti-monarchists remember George V in a negative manner. Well, maybe in India, but he is not the Emperor I meant.
Lets see.....Yamato?
Transmission not understood. 
There is a battleship of that name, but no emperor that I know of.
Just taking a shot at it. I don't know of an emporer by that name either.
No. If there was a notably successful warship named after him I am unaware.
Kaiser Franz Joseph I protected cruiser completed 1890, ceded to France as war reparation and foundered and sunk in Oct. 1919. As you say, "not notably successful."