d. Unknown) was known as a lawyer and doctor utriusque iuris (lit. "doctor of either law" - a Latin term used to describe those who studied civil as well as canon law). He received his doctorate in 1480 but the date at which he became a lawyer is unknown. Throughout his life, he wrote many repitiones and notabilia on many canons and decretals. In addition, he taught Roman law

Roman law

Roman law is the legal system of ancient Rome, and the legal developments which occurred before the 7th century AD — when the Roman–Byzantine state adopted Greek as the language of government. The development of Roman law comprises more than a thousand years of jurisprudence — from the Twelve...

 beginning in the year 1482. He is most known for inventing the Chinese Water Torture

Chinese water torture

Chinese water torture is the popular name for a method of water torture in which water is slowly dripped onto a person's forehead, allegedly driving the restrained victim insane...

 method in which drops of water would constantly fall on a victim's forehead at an inconsistent pace, causing the victim to go insane. He also was the first person to use sleep deprivation

Sleep deprivation

Sleep deprivation is the condition of not having enough sleep; it can be either chronic or acute. A chronic sleep-restricted state can cause fatigue, daytime sleepiness, clumsiness and weight loss or weight gain. It adversely affects the brain and cognitive function. Few studies have compared the...

 as a means of torture, where the interrogators would ask the same questions many, many times, and the interrogators would shake the person at random intervals or prick him with a sharp pin and force him to march down the hallways endlessly, if the interrogators grew weary they would switch out with another group, who then would ask the same basic questions (today police use this method, but it is known as the third degree

Third degree (interrogation)

The third degree is a euphemism for the "inflicting of pain, physical or mental, to extract confessions or statements". In 1931 the Wickersham Commission found that use of the third degree was widespread in the United States. No one knows the origin of the term but there are several hypotheses. The...

).

Written texts

Singularia seu notabilia - earliest recorded print published in Milan

Milan

Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

 in 1512

Repetitiones in uniuersas fere iuris canonici III - earliest recorded print published in Venice

Venice

Venice is a city in northern Italy which is renowned for the beauty of its setting, its architecture and its artworks. It is the capital of the Veneto region...

in 1587.

Tractatus de questionibus, in quo materie maleficiorum pertractant(ur) - published 1524

De Marsiliis was probably well known among jurists all over Europe. In a book printed in 1762 over the history of Icelandic procedural law the Icelandic jurist, Jón Árnason, made references to de Marsiliis. See: «Historisk Indledning til den gamle og nye Islandske Rettergang»,i.e. «An Historical Introduction to the History of Icelandic Procedural Law». The reference is made under «Fortalen», i.e. «Introduction».