On 26 October 1967, twenty-six years into his reign as Shah ("King"), he took the ancient title Shāhanshāh ("Emperor" or "King of Kings") in a lavish coronation ceremony held in Tehran. He said that he chose to wait until this moment to assume the title because in his own opinion he "did not deserve it" up until then; he is also recorded as saying that there was "no honour in being Emperor of a poor country" (which he viewed Iran as being until that time)
Nostalgia is a sentimentality for the past, typically for a period or place with happy personal associations.
Nostalgia is triggered by something reminding an individual of an event or item from their past. The resulting emotion can vary from happiness to sorrow. The term of "feeling nostalgic" is more commonly used to describe pleasurable emotions associated with and/or a longing to go back to a particular period of time, although the former may also be true.