Source: The Great Interpretation of Dreams (Ibn Sirin)
Seeing a deceased king in a dream indicates weakness of the state, ruin of the country, or injustice of the current ruler.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Seeing a deceased king alive indicates the return of justice or the appearance of truth.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Seeing a deceased king is interpreted as weakness and humiliation.