Of course, there are much earlier accounts of the nosferatu , the undead. Reports about Lamias , or predatory ghosts, date back to ancient Greece. The French expert on vampires, Jean Marigny [J Marigny, 'La Tradition Legendaire du Vampire en Europe', Les Cahiers du G.E.R.F. , Grenoble University of Languages and Letters, 1987. ] states that:

Well before the 18th Century, the epoch when the word 'vampire' first appeared, people believed in Europe that the dead were able to rise from their graves to suck the blood of the living. ... The oldest of these chronicles date from the 12th and 13th Centuries, and, contrary to what one might expect, are not set in remote parts of Europe, but in England and Scotland'.

But the cases he cites are mostly about how dead people haunt the living, get into bed with them and drain their energy. And when the bodies are disinterred they are not decomposed. In the majority of the cases there is no blood sucking.