Many centuries ago, legend has it that one Piers Shonks killed a dragon, and in doing so angered the Devil himself. The Devil demanded that he have Piers soul, to which he duly agreed stating that he could have it whether he was buried inside or outside the church. However, the cunning Piers left instructions for his body to be buried in the walls of the church, and cheating the Devil himself!
For further information, please read Haunted Britain by Antony D. Hippisley Coxe.