Amatus of Montecassino (Latin: Amatus Casinensis ), (11th century) was a Benedictine monk of the Abbey of Montecassino who is best known for his historical chronicles of his era.
 His "History of the Normans" (which has survived only in its medieval French translation, "L'Ystoire de li Normant"), is one of three principle primary sources for the Norman Conquest of southern Italy--the other two being the histories of William of Apulia and Geoffrey Malaterra.
 Amatus describes the Normans from the perspective of his abbey, one of the most important religious and cultural centers in Italy at the time.
 His history is the earliest extant account of the Norman sieges of Bari and Salerno, their conquest of Sicily, and the careers of both Robert Guiscard and Richard Drengot, as well as the Gregorian Reforms seen from the papal point of view.
Niflheim (or Niflheimr) ("Mist Home", the "Abode of Mist" or "Mist World" , or probably "world of the darkness" according to the Oxford English Dictionary) is one of the Nine Worlds and is a location in Norse mythology which sometimes overlaps with the notions of Niflhel and Hel.
 The name "Niflheimr" only appears in two extant sources: "Gylfaginning" and the much-debated "Hrafnagaldr Óðins".
Sensitive compartmented information (SCI) is a type of United States classified information concerning or derived from sensitive intelligence sources, methods, or analytical processes.
 All SCI must be handled within formal access control systems established by the Director of National Intelligence.
 Although some sources refer to SCI control systems as special access programs, the intelligence community itself considers SCI and SAPs distinct kinds of controlled access programs.
The Officer Qualification Record (OQR), NAVMC 123a, is one of the best sources of information concerning US Marine officers.
 It is similar to the enlisted Service Record Book (SRB) with only minor differences.
 This "record presents a cumulative and concise summary of basic events in the officer's career from the time of acceptance of appointment to separation.
 The OQR also serves as the basis for reporting information into the Marine Corps Total Force System and provides commanders with background information to assist them in officer personnel planning and assignment."
The West Indian Ocean coelacanth ("Latimeria chalumnae"), sometimes known as the African coelacanth is one of two extant species of coelacanth, a rare order of vertebrates more closely related to lungfish, reptiles and mammals than to the common ray-finned fishes.
 It has a vivid blue pigment, and is the better known of the two extant species.
 The species has been assessed as critically endangered on the IUCN Red List.
Peter Abelard ( ; Latin: "Petrus Abaelardus" or "Abailardus"; French: "Pierre Abélard" , ] ; 1079 – 21 April 1142) was a medieval French scholastic philosopher, theologian and preeminent logician.
 His love for, and affair with, Héloïse d'Argenteuil have become legendary.
 The "Chambers Biographical Dictionary" describes him as "the keenest thinker and boldest theologian of the 12th Century".
Peter of Bruys (also known as Pierre De Bruys or Peter de Bruis; "fl.
" 1117 – c.1131) was a popular French religious teacher, who is called a heresiarch (leader of a heretical movement) by the Roman Catholic Church because he criticized infant baptism, opposed the erecting of churches and the veneration of crosses, opposed the doctrine of transubstantiation, and denied the efficacy of prayers for the dead.
 An angry mob killed him in or around the year 1131.
 Information concerning Peter of Bruys is derived from two extant sources, the treatise of Peter the Venerable against his followers and from a passage written by Peter Abelard.
The Socratic problem (or Socratic question) is a term used in historical scholarship concerning attempts at reconstructing a historical and philosophical image of Socrates based on the variable, and sometimes contradictory, nature of the existing sources on his life.
 Scholars rely upon the extant sources such as those of contemporaries like Aristophanes or disciples of Socrates like Plato and Xenophon for knowing anything about Socrates.
 However, these sources contain contradictory details of his life, words, and beliefs when taken together.
 This complicates the attempts at reconstructing the beliefs and philosophical views held by the historical Socrates.
 It is apparent to scholarship that this problem is now deemed a task seeming impossible to clarify and thus perhaps now classified as unsolvable.
Abelyar (Russian: Абеля́р ) is Russian male first name.
 It was included into various Soviet calendars in 1924–1930, which included the new and often artificially created names promoting the new Soviet realities and encouraging the break with the tradition of using the names in Synodal Menologia.
 The name was created to honor Pierre Abélard (romanized from Russian as "Pyer Abelyar"), a medieval French scholastic philosopher.
The Répertoire International des Sources Musicales (RISM, English "International Inventory of Musical Sources", German "Internationales Quellenlexikon der Musik") is an international non-profit organization, founded in Paris in 1952, with the aim of comprehensively documenting extant sources of music all over the world.
 It is the largest organization of its kind and the only entity operating globally to document written musical sources.
 Shortly after its founding, A.H. King called RISM, "one of the boldest pieces of long-term planning ever undertaken for the source material of any subject in the humanistic field."

Question: Information concerning Peter of Bruys is derived from two extant sources one of which is a passage written by a medieval French scholastic philosoper that had an affair with who?
Answer: Héloïse d'Argenteuil