Gilles de Rais was quite affluent during the Hundred Year's War with England, fighting alongside Joan of Arc. He made quite a reputation for himself, even being granted the title, Marshall of France, but in his early thirties he retired from military life and retreated from public society. During his retirement, he was labeled a spendthrift after his extravagant lifestyle began to catch up with him. He depleted his fortune by funding the construction of the Chapel of Holy Innocents and staging a massive theater spectacle that he composed himself. The theater production was so extravagant that it required 140 speaking parts and 2000 extras. If that wasn't enough, unlimited drinks and food were available for guests, and after each production, the costumes were discarded then later remade from scratch for the next performance.
When his coffers began running low, he would sell off one of his many estates. Eventually, his family had to take legal steps to curb his spending, pleading to Pope Eugene IV to intervene (they were denied due to the fact de Rais was building the Chapel of Holy Innocence) but it was Charles VII who put forth a royal edict forbidding anyone from signing contracts with, or buying property from, the Baron.
It is unknown when Gilles de Rais became interested in the occult but he began searching for those skilled in alchemy and demon summoning in the late 1430s. After various failed attempts to summon a demon, he was informed his failures were due to the fact that he needed sacrifices--young boys. Baron Gilles later confessed his first assaults on young boys were in the early 1430s when he was still in the military. He confessed that he would take poor children, pamper them, dress them in lavish clothing, feast with them, and then invite them upstairs where only his innermost circle were allowed. Once there, their dire situation would dawn on the child and Gilles reported taking pleasure in their fear. After the killings, he would cruelly dismembered them (the most handsome of victims he would lay with beforehand). He burned the bodies limb by limb to lessen the smell. The ashes and bones were dumped in the moat or other hiding places.
But for years, he was never suspected. The only reason he was investigated was in 1440, he attempted to kidnap a member of the clergy who escaped then reported the assault to the Bishop of Nantes. The Bishop ordered an investigation and it wasn't long before Gilles de Rais was arrested n 1440. Due to the overwhelming amount of evidence the courts were able to bring up on him, de Rais confessed to at least 80 murders, but without the remains of the bodies the exact number is unknown. The Bishop of Nantes sentenced him to death and he was beheaded short after. His family was able to vie for mercy from the Bishop who allowed de Rais to be buried at Notre Dame.
Following Gilles de Rais execution, his actual confession and guilt were called into question though. It was theorized that he may have been a victim of the Inquisition and that his confession was nothing more than a man wanting release from the torture he was put through.
So was he a patsy or a pedophiliac murderer? The jury is still out on that one but it goes to show that no one, not even a powerful noble, is above the law.