Jacob Gerard Nicolaas (Jaap) Renaud (
Voorburg
Voorburg is a town and former municipality in the west part of the province of South Holland, Netherlands. Together with Leidschendam and Stompwijk, it makes up the municipality Leidschendam-Voorburg. It has a population of about 39,000 peop ...
, 20 February 1911 - 25 April 2007) was a Dutch archaeologist and Adjunct professor at
Utrecht University
Utrecht University (UU; nl, Universiteit Utrecht, formerly ''Rijksuniversiteit Utrecht'') is a public research university in Utrecht, Netherlands. Established , it is one of the oldest universities in the Netherlands. In 2018, it had an enrollm ...
.
Life
Family
Renaud's father was a
house painter supervisor
A supervisor, or lead, (also known as foreman, boss, overseer, facilitator, monitor, area coordinator, line-manager or sometimes gaffer) is the job title of a lower-level management position that is primarily based on authority over workers or ...
. His grandfather was a school teacher, whom the young Renaud often visited. Together they would visit many castles near The Hague. Renaud would recreate these in his attic from the wood of cigar boxes, including the siege equipment. At the young age of 14 he already visited The Hague municipality archives to study the history of
Binckhorst Castle
Binckhorst Castle is a 16th and 17th century manor built on top of a demolished medieval castle.
Location
Binckhorst Castle is located in The Hague city quarter of the same name. It used to be part of the now former Voorburg municipality till ...
and its inhabitants.
In the tradition of his family Renaud also became a school teacher, but during the
Great Depression he could not acquire a fixed position. He married Hanna Maartense whom he had met at the (NBAS), a student movement for alcohol abstinence. Together they visited European castles by bicycle and tent.
Early career

Due to cost constraints academic studies were not possible for Renaud. However, his brother in law W.F. Maartense was a Geography teacher. He brought him into contact with professor Nicolaas Bernardus Tenhaeff (1885-1943) from Amsterdam University taught him in private.
In 1938 Renaud gave his first lecture, treating medieval pottery.
Two publications were important for Renaud's early career. The first was about Binckhorst Castle, published in 1936. The other was about the construction history of
Egmond Castle
Egmond Castle ( nl, Kasteel Egmond), also called the ''Ruins of Egmond'' ( nl, Ruïne van Egmond), is a ruined medieval castle in the Dutch province of North Holland. It is located in Egmond aan den Hoef in the municipality of Bergen and lies a ...
. These brought him into contact with the famous archaeologist
A.E. van Giffen (1884-1973) from the
University of Groningen
The University of Groningen (abbreviated as UG; nl, Rijksuniversiteit Groningen, abbreviated as RUG) is a public research university of more than 30,000 students in the city of Groningen in the Netherlands. Founded in 1614, the university is the ...
, and Professor Engelbert Hendrik ter Kuile (1900-1988) from the (the national organization for the preservation of monumental buildings).
World War II
After the Dutch defeat in May 1940 Renaud was demobilized. He then got a job as a contractor at the Rijksbureau voor de Monumentenzorg.
His first assignment was to describe medieval houses in Maastricht. The next assignments were connected to the
German bombing of Rotterdam
Rotterdam was subjected to heavy aerial bombardment by the ''Luftwaffe'' during the German invasion of the Netherlands in World War II. The objective was to support the German troops fighting in the city, break Dutch resistance and force the D ...
. In its wake he led archaeological excavations at
Spangen Castle
Spangen Castle (also known as ter Nesse) was a medieval castle near the village Overschie. It has disappeared completely. The Rotterdam city quarter Spangen was named for the castle.
Castle Characteristics
Disappearance and excavation
The l ...
and Bulgersteyn Castle and had the daily supervision of the excavations at Starrenburg and Weena.
During the war period Renaud learned a lot from the advice of architectural history Professors E. ter Kuile from Delft University and M.D. Ozinga from Utrecht University. He also learned a lot about masonry and other crafts from the overseers of the works in Rotterdam.
Later career
In 1950 Renaud got an appointment at the (ROB), a national government organization for archaeology. This would remain his full time job till his retirement in 1976. In the 1950s he also became involved with the (NKS) (Dutch Castle Foundation) an organization that aimed to preserve the remaining Dutch castles. He would become a member of the board of this foundation, and would lead some of its important publications / journals.
Caen
Later in the 1950s the
Dutch Research Council
The Dutch Research Council (NWO, Dutch: Nederlandse Organisatie voor Wetenschappelijk Onderzoek) is the national research council of the Netherlands. NWO funds thousands of top researchers at universities and institutes and steers the course o ...
(NWO) provided funding for Renaud to work in
Caen
Caen (, ; nrf, Kaem) is a commune in northwestern France. It is the prefecture of the department of Calvados. The city proper has 105,512 inhabitants (), while its functional urban area has 470,000,[Normandy
Normandy (; french: link=no, Normandie ; nrf, Normaundie, Nouormandie ; from Old French , plural of ''Normant'', originally from the word for "northman" in several Scandinavian languages) is a geographical and cultural region in Northwestern ...]
, France. Professor of Norman and medieval history Michel de Boüard (1909-1989) of
Caen University had asked him to assist in the excavation and restoration of the
Château de Caen The Château de Caen is a castle in the Norman city of Caen in the Calvados ''département'' (Normandy). It has been officially classed as a '' Monument historique'' since 1997.
History
The castle was built c. 1060 by William the Conqueror (Will ...
. Renaud led part of these from 1958 to 1962. Afterwards, De Boüard became his
doctoral advisor
A doctoral advisor (also dissertation director, dissertation advisor; or doctoral supervisor) is a member of a university faculty whose role is to guide graduate students who are candidates for a doctorate, helping them select coursework, as well ...
. In August 1963 Renaud was made a
Doctor Honoris Causa
An honorary degree is an academic degree for which a university (or other degree-awarding institution) has waived all of the usual requirements. It is also known by the Latin phrases ''honoris causa'' ("for the sake of the honour") or '' ad h ...
of Caen University.
In 1965 Renaud was appointed as lecturer in the science of castles () at Utrecht University. It was an appointment for one hour a week, made on the insistence of the NKS. Meanwhile, Reanud continued to work at the ROB. Therefore, the appointment generated more prestige than income, but prestige of course came in handy, when the NKS wanted to discuss preservation. In 1980 Renaud's position at Utrecht was upgraded to that of a professor. From 1971 to 1981 he was also connected to
Delft University of Technology
Delft University of Technology ( nl, Technische Universiteit Delft), also known as TU Delft, is the oldest and largest Dutch public technical university, located in Delft, Netherlands. As of 2022 it is ranked by QS World University Rankings among ...
.
Active in retirement

In March 1976 Renaud retired as scientific employee of the ROB. He nevertheless continued to work on publications. First amongst these was Castellogica, a journal about castles that appeared from 1983 to 2000. He also stayed on for some years as professor in Delft and Utrecht.
Legacy
In 2019 Renaud's student Jean Roefstra summarized Renaud's work as follows: 'Renaud was one of the first Dutch archeologists who was convinced that investigation into the phenomenon castle castle required a broad approach. He thought that the castle had to be considered from a historic, archaeologic, typologic and literary perspective in order to understand the object in its entirety. This line of thought was the basis for the current integral and multidisciplinary approach of castle investigations.
In 2016 De Gast had concluded that Renaud had indeed been a savior for many castles. His work had also saved a lot of information that would otherwise have been lost, and he had been crucial for getting public support for conservation and science. On the other hand, from the 1960s onwards, his focus on construction history, and his failure to pick up on new scientific methods of archaeology led to suboptimal results. The possible explanation is that Renaud had been trained as a historian, not as an archaeologist.
Selected works
Uit de bouwgeschiedenis van den Binckhorst (1936)Uit de bouwgeschiedenis van het slot op den hoef (1938)
References
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Notes
{{DEFAULTSORT:Renaud, Jaap
20th-century Dutch archaeologists
1911 births
2007 deaths