A coffin in a dream rarely predicts death literally -- it more often marks an ending you're processing, or feelings you've buried rather than let yourself fully grieve. An open coffin can point to something from the past resurfacing, while a sealed one often reflects a chapter you've genuinely closed.
Every city built with Mars in the Midheaven, or any other fixed star from the same nature, will see the majority of its governors die by the sword. - Ptolomeus