Question: What did Pseudo-Ingulf write that is an important primary source for English medieval history, particularly the late 15th century?

Context paragraphs:
Gothic art: Gothic art was a style of medieval art that developed in Northern France out of Romanesque art in the 12th century AD, led by the concurrent development of Gothic architecture.  It spread to all of Western Europe, and much of Southern and Central Europe, never quite effacing more classical styles in Italy.  In the late 14th century, the sophisticated court style of International Gothic developed, which continued to evolve until the late 15th century.  In many areas, especially Germany, Late Gothic art continued well into the 16th century, before being subsumed into Renaissance art.  Primary media in the Gothic period included sculpture, panel painting, stained glass, fresco and illuminated manuscripts.  The easily recognizable shifts in architecture from Romanesque to Gothic, and Gothic to Renaissance styles, are typically used to define the periods in art in all media, although in many ways figurative art developed at a different pace.

Andreas of Bergamo: Andreas of Bergamo (Latin: "Andreas Bergomas" or "Bergomatis" ) was an Italian historian of the late ninth century.  He composed a continuation of the "Historia Langobardorum" of Paul the Deacon in 877.  The short continuation, sometimes called the "Andreæ presbyteri Bergomatis chronicon", continues Paul's history up until the late 870s.  It is an important primary source for the Italy, and especially the Lombardy, of its time and is the best source for the succession dispute following the death of the Emperor Louis II.

Fiant: A fiant was a writ issued to the Irish Chancery mandating the issue of letters patent under the Great Seal of Ireland.  The name "fiant " comes from the opening words of the document, "Fiant litterae patentes ", Latin for "Let letters patent be made".  Fiants were typically issued by the chief governor of Ireland, under his privy seal; or sealed by the Secretary of State, who served as "Keeper of the Privy Seal", just as the English Secretary of State did in England.  Fiants dealt with matters ranging from appointments to high office and important government activities, to grants of pardons to the humblest of the native Irish.  Fiants relating to early modern Ireland are an important primary source for the period for historians and genealogists.  The Tudor fiants were especially numerous, many relating to surrender and regrant.  A fiant often provides more information than the ensuing letters patent recorded on patent rolls.  There are also fiants for which the patent roll does not list any letters patent, either because none were issued or because those issued were never enrolled, through accident or abuse.  Prior to the Act of Explanation 1665, letters patent were enrolled (if at all) after they were granted; under the act, the fiant was enrolled first, and the letters issued afterwards.  Thereafter the rolls, which were catalogued in the 19th century, give the same information as the original fiants.

Liber Historiae Francorum: Liber Historiae Francorum (English: "The book of the history of the Franks" ) is an anonymous 8th-century chronicle.  The first sections are a secondary source for early Franks in the time of Marcomer, giving a short "breviarum" of events until the time of the late Merovingians.  The subsequent sections of the chronicle are an important primary source for the contemporaneous history and provide an account of the Pippinid family in Austrasia before they became the more famous "Carolingians".

Croyland Chronicle: The Croyland or Crowland Chronicle is an important primary source for English medieval history, particularly the late 15th century.  It is named for its place of origin, the Benedictine Abbey of Croyland or Crowland, in Lincolnshire, England.  It was formerly also known as the Chronicle of Ingulf or Ingulphus after its supposed original compiler, the 11th-century abbot Ingulf.  As that section of the text is now known to have been a later forgery, he is instead known as Pseudo-Ingulf.

Pseudo-Ingulf: Pseudo-Ingulf is the name given to an unknown English author of the "Historia Monasterii Croylandensis", also known as the Croyland Chronicle.  Nothing certain is known of Pseudo-Ingulf although it is generally assumed that he was connected with Croyland Abbey.

Christopher Allmand: Christopher Thomas Allmand (born 1936) is an English medieval historian, with a special focus on the Late Middle Ages in England and France, and the Hundred Years' War.  He was Professor of Medieval History at the University of Liverpool until his retirement in 1998, and is now Honorary Senior Fellow at the university.  He has written a much-used monograph on the Hundred Years' War, a biography of King Henry V of England, and he has edited the seventh and final volume of The New Cambridge Medieval History.

Peter Coss: Peter R. Coss is a British historian, specialising on the history of the English medieval gentry.  He is currently Professor of Medieval History at the School of History, Archaeology, and Religion at Cardiff University, Wales.  His research interests also include 12th- to 15th-century English social history and Italian history from the same period, as well as visual history/social display and literature and history.  As of 2008, he is working on a comparative project between the English gentry and the nobility of Tuscany, and another on the foundations of gentry culture.  Coss studied under Rodney Hilton.  He is a member of the historical journal Past & Present, and also a former member of the council of the Royal Historical Society.

Jaroslav Goll: Jaroslav Goll (14 July 1846 – 8 July 1929) was a Czech historian, medievalist, educator, writer and translator.  He was a representative of the historical positivism.  He studied history at the Charles University in Prague under Czech Václav Vladivoj Tomek and German Konstantin Höfler.  In 1871 he worked at the University of Göttingen where he was influenced by positivist Georg Waitz.  Then he studied in Berlin, Hague and London.  In 1875, he began teaching at the University of Prague, where he worked until his retirement in the year 1910.  Then he very actively involved in politics.  In 1895 he founded the "Český časopis historický" ("Czech Historical Review"), the most important historical journal in the Czech lands, which still exists today.  In 1907 he was elected rector of the university.  His main professional interest was English medieval history.  He also devoted a study personalities of Czech history (Komenský, Palacký, Chelčický).  His pupils are called Goll's school.  He gave private lessons later Emperor Charles I during his studies in Prague.  He was the grandfather of the Czech actress Nataša Gollová.

Stank Hall: Stank Hall is a historic building in Beeston, a suburb of Leeds in England.  It was built in the late 15th century for the Beeston family.  It has been listed as Grade II by English Heritage since 19 October 1951.  Immediately to the north stands a Grade II*–listed barn of the late 15th – early 16th century that was also built for the Beeston family and was acquired by the Hodgson family in the 17th century.  In 2014, the barn was acquired from the Leeds City Council by the Friends of Stank Hall Barn, with the intent of restoring it.

Supporting paragraphs: Pseudo-Ingulf Croyland Chronicle
Answer: Croyland Chronicle