Felo de se (from Medieval Latin fel[l]ō dē sē, "felon of him-/herself") was a concept applied against the personal estates (assets) of adults who ended their own lives.
[1] Early English common law, among others, by this concept considered suicide a crime—a person found guilty of it, though dead, would ordinarily see penalties including forfeiture of property to the monarch and a shameful burial.
The crime was punishable by forfeiture (great loss of property) to the monarch and what was considered a shameful burial – typically with a stake through the heart and at a crossroads.
[2] A child or lunatic (a term which included the demonstrably mentally disabled) who killed themself was excepted from this post mortem offence, which resembled attainder.
[3] By the Burial Laws Amendment Act 1880 funeral rites were defaulted to a "Christian and orderly religious service", substituting that taken from the Book of Common Prayer if required (i.e. if the deceased was known to be of other religion).
[7] Elsewhere in Ireland, suicides were often buried at cillín plots, which were also used for stillborn and unbaptised babies, executed criminals, shipwrecked bodies, beggars and other outsiders.