In that year, there were four emperors (Nero, Otho, Galba, and Vespasian), and the secret of the Roman Empire--that in a time of turmoil, a provincial commander with an army could march on Rome and become emperor--was revealed, but Rome's decline was a long way off.

Does it follow that "Nero was the longest reigning emperor that year."?
Select from the following.
1). yes;
2). it is not possible to tell;
3). no;
2).