"Narcissistic Personality Disorder is a disorder that is characterized by a long-standing pattern of grandiosity (either in fantasy or actual behavior), an overwhelming need for admiration, and usually a complete lack of empathy toward others. People with this disorder often believe they are of primary importance in everybody’s life or to anyone they meet. While this pattern of behavior may be appropriate for a king in 16th Century England, it is generally considered inappropriate for most ordinary people today."
Psychcentral.com