Question

Why were Roman emperors deified after death?

And the next one is

Why were some emperors not deified?​

Answer 1

It was a standard practice to be deified.

Step-by-step explanation:

Answer 2

Nearly every emperor following Alexander was deified by the Senate as standard practice.

Step-by-step explanation:

It is important to note that by this time in Roman history, nearly every emperor following Alexander was deified by the Senate as standard practice. In reality, only a very few were not deified up to this point (Tiberius, Caligula, Nero, Commodus and various usurpers).