The emperor Alexander III died at the age of 49. Here is all you want to know, and more!
Biography - A Short Wiki
Emperor of Russia, King of Poland and Grand Prince of Finland from 1881 to 1894. He was known for being a conservative leader who went back on many of the liberal acts that his father passes as King.
He married his brother’s former fiancee, Maria Feodorovna, in 1866.