Publications
Urban Heritage After War Destruction: Heritage Dynamics in the Buffer Zone of Aachen Cathedral
Aachen Cathedral's buffer zone reflects evolving heritage dynamics, with only 4% of buildings protected post-2013 and 55% rebuilt. This study reveals how contemporary interventions integrate into historical urban fabric, challenging traditional notions of heritage significance. By analyzing 405 protected structures—considering protection dates, construction periods, reconstructions, and uses—the research offers insights into the management of UNESCO-listed sites. It underscores that heritage now encompasses identity, continuity, and modern integration, moving beyond historical or universal value alone.
A Semantic Classification Approach for the Aachen Cathedral
A novel semantic classification approach, integrating 3D survey data and machine learning, demonstrates significant potential for distinguishing materials and construction techniques in historic masonry, particularly at UNESCO World Heritage sites like Aachen Cathedral. The study, focusing on the Westwerk area, combines terrestrial laser scanning (TLS) and photogrammetric point clouds with supervised algorithms (Random Forest) and 2D image segmentation via META’s Segment Anything Model (SAM). Findings reveal that 3D geometry-based classification excels in identifying features with strong morphological differentiation, while 2D approaches are more effective for visually subtle or geometrically similar elements. Annotated 2D masks projected onto the 3D model enhance classification reliability, contributing to scalable, semi-automatic documentation and conservation planning for complex heritage sites.
Radiocarbon measurements of iron girders from Aachen cathedral
Radiocarbon dating of iron girders from Aachen Cathedral reveals that the Carolingian Palace Chapel's construction dates between CE 793 and 813, aligning with historical records. The study demonstrates the reliability of this method for ancient iron, though it highlights challenges due to contamination from exogenous carbon sources such as old wood, flux additives, or modern reconstruction materials. Notably, iron beams from the Gothic Annex showed variable radiocarbon signatures, likely due to medieval forging techniques and recent welding with fossil carbon. The research also compared iron dates with those of contemporary wood and charcoal, providing a robust age reference framework.
The Age of Imperial Bishops II
Aachen Cathedral emerged as a pivotal center of imperial power during the Salian dynasty, with the archbishops of Cologne securing three critical privileges that endured through the Middle Ages. These included an exclusive vote in royal elections, the right to crown newly elected kings within Aachen's cathedral, and the office of archchancellor of Italy. The study, part of a broader examination of the Imperial City of Cologne, traces how these bishops navigated political dynamics to solidify their authority, reshaping the balance of power in medieval Europe.
The shape of (Point) Clouds
Point clouds generated by 3D capturing technologies such as Terrestrial Laser Scanning (TLS) and Structure from Motion (SfM) represent a paradigm shift in the surveying of built heritage, moving beyond traditional subjective interpretations to a more objective yet still cognitive process. Research on sites like Aachen Cathedral reveals that while data acquisition aligns with scientific rigor, interpretation remains an authorial act. Digital infrastructures and HBIM frameworks enable new readings of historical architecture, positioning point clouds as both autonomous sources and representational forms that preserve spatial and material memory. This study underscores the epistemic significance of point clouds as a digital palimpsest where knowledge and interpretation converge.
Willigis and his Cathedral – the Building of a New Coronation Church by the Archchancellor and Archbishop of Mainz
A groundbreaking analysis reveals that Willigis, Archbishop of Mainz and Archchancellor of the Holy Roman Empire, constructed the Willigis Cathedral to serve as a coronation church, following his exclusion from conducting coronations at Aachen Palatine Chapel due to ecclesiastical disputes. This study proposes that Willigis incorporated iconographic and topographical references to the Empire, drawing inspiration from Old St Peter’s in Rome, where imperial coronations were traditionally held. The research sheds light on the strategic architectural choices made by Willigis to assert his authority within the Holy Roman Empire, while also suggesting a new original location for the Willigis doors, further enriching our understanding of medieval ecclesiastical and political dynamics.
Alcuin als planender Architekt in York und Aachen *
Recent research sheds new light on Alcuin's role as a church planner, particularly in the construction of Aachen Cathedral and St. Sophia's Church in York. The study presents two novel pieces of evidence suggesting significant progress in the cathedral's construction between 795 and 799, challenging previous assumptions about its timeline. It also proposes the use of Italian columns in Aachen and other churches, such as Centula and Saint-Amand, linking Alcuin's influence to broader architectural practices of the era. Additionally, the article highlights Alcuin's donation of Bible copies and his connection to the oldest Vitruvius manuscript, Harleianus 2767, offering a deeper understanding of his intellectual and architectural legacy.
Chapter Three. Strangers and Neighbors
Aachen Cathedral experienced a period of social integration between Dutch Reformed Protestants and local communities during the 16th century without significant cultural or economic tensions. The study reveals that migrants from the Low Countries, primarily artisans and craftsmen, spoke a dialect closely related to local languages, facilitating seamless communication. Unlike other regions, these immigrants did not dominate specific industries like cloth weaving but were diverse in professions such as baking, carpentry, and tailoring. Confessional differences existed but were not exacerbated by linguistic or ethnic divides, leading to a triconfessional coexistence managed by the city council. The research challenges the notion that Dutch immigrants introduced Reformed ideas to Aachen, instead highlighting their integration into local society and the absence of notable conflicts.
Reliquaries in the form of church buildings in european culture
European medieval art achieved remarkable sophistication through the creation of reliquaries shaped as churches, blending architectural aesthetics with spiritual significance. These intricate works, often adorned with ivory and enamel, evolved from simple oblong designs to complex structures featuring side naves, transverse elements, and decorative turrets—mirroring Romanesque church architecture. Notable examples, such as those in Aachen Chapel and Cologne Residence, showcase the craftsmanship of the time, particularly in Rhine regions. The study highlights how these reliquaries, including the famed 'Sarcophagus of the Three Wise Men,' reflect the cultural and religious developments of the period, serving as both vessels for relics and masterpieces of medieval art.
The Diffusion and Use of the Institutio canonicorum in Ninth-Century West Francia. A Study of the Preserved Manuscripts
A systematic analysis of ninth-century manuscripts reveals that the Institutio canonicorum (IC), established at the Council of Aachen in 816, experienced widespread diffusion and sustained use across West Francia. By the mid-ninth century, numerous copies had been produced in various scriptoria, indicating significant adoption beyond its initial novelty. These manuscripts, primarily distributed to cathedral chapters, often included additional chapters tailored to local needs while adhering to the original text. The study also shows that these codices were intensively studied and annotated over time, reflecting enduring engagement with the Carolingian rule of life long after the reform councils.
Evolution of Recording Methods: The Aachen Cathedral World Heritage Site Documentation Project
A collaborative project has successfully demonstrated the application of modern terrestrial laser scanners and photogrammetric imaging systems to create highly accurate 3D documentation of the Aachen Cathedral. This method provides objective as-built records that support conservation, management, monitoring, and repair efforts while serving as an educational resource. The study compares these advanced recording techniques with previous documentation work done at the Cologne Cathedral, highlighting their effectiveness for architecturally complex heritage sites.
The Persistence of the Sacred: German Catholic Pilgrimage, 1832–1937 by Skye Doney (review)
A study of German Catholic pilgrimage practices from 1832 to 1937 reveals the persistence of spontaneous, unarticulated piety among lower-class and less-educated pilgrims, contrasting with the evolving bureaucratic and empirical attitudes of the church hierarchy. The research, based on extensive archival materials, periodicals, and ephemeral memorabilia, highlights a tension between official religious discourse—marked by positivist scrutiny of miraculous claims—and the enduring desire of pilgrims to engage physically with sacred relics or their representations. While the study critiques the rationalization of Catholic piety under clerical influence, it lacks exploration of external factors such as ecclesiastically sponsored devotions or broader societal shifts in medicine and illness, leaving its central premise partially unproven.
The Vaulting System of the Palatine Chapel: The Aachen Cathedral World Heritage Site Documentation Project
A novel analysis of the Palatine Chapel's conic vaults, part of Aachen Cathedralreveals a sophisticated VIII/IX century architectural solution. Using 3D point cloud data from extensive capturing campaigns (2022–2023), researchers reconstructed idealized geometric models of these vaults and compared them with actual structural data. The study highlights the precision of conic surface extraction and unfolding techniques, producing high-resolution ortho-images that offer unprecedented insights into the chapel's structural integrity and historical design. This method sets a benchmark for digital documentation of heritage sites, bridging gaps between idealized geometry and real-world construction.
Architectural Design Canons from Middle Ages and Before: An Inspiration for Modern Sustainable Construction
Ancient and medieval architectural designs, including those of the Aachen Cathedral, were grounded in geometric and arithmetic principles that reflected cosmic order and harmony. These design canons, often symbolic, served both structural and allegorical purposes, conveying intangible messages from commissioners. Metric analysis of six iconic structures—ranging from the Cheops pyramid to Castel del Monte—reveals consistent design practices with probable semantic content. This study demonstrates that such historical examples can inspire modern sustainable construction by integrating timeless geometric principles into contemporary creative design.
Pilegrimsspor fra Tynset: En detektorfunnet blymedaljong med kristne motiver
A lead medallion discovered by a metal detectorist in Tynset, Norway, has been identified as a late medieval pilgrim badge, likely originating from Aachen Cathedral in Germany. The medallion features Christian iconography, including the apocalyptical Mary with Christ and a passion and resurrection scene, which are comparable to known European pilgrim badges. Comparative analysis with Norwegian and European amulets suggests its connection to Aachen, one of Europe's most significant pilgrimage sites during the medieval period. The study also explores how such amulets may have influenced their bearers, potentially offering insights into the religious practices and beliefs of Norwegian pilgrims.
Regional into Regionalist
Architectural elements from Roman monuments were repurposed to support regionalist movements against the rising Papal global empire, demonstrating their political and cultural significance. The study examines how cathedrals and palaces in Rome and Aachen, along with a private house in Rome, served as symbols of regional autonomy and 'apostolic poverty.' By analyzing these structures, researchers reveal how architecture played a pivotal role in resisting centralized power while fostering local identity during the transition from the Roman Empire to early medieval Europe.
Real Walking in Virtual Spaces: Visiting the Aachen Cathedral
Spatial compression techniques enable users to traverse larger virtual environments than their physical tracking area allows, enhancing the immersive experience of Virtual Reality (VR). This demo showcases ongoing research by demonstrating real walking through a detailed model of Aachen Cathedral within a room-sized tracking space. By addressing the mismatch between VR tracking limits and virtual environment size, this approach preserves the natural intuitiveness of walking while expanding exploration capabilities in VR applications.
Retrofitting Aachen Cathedral with an Innovative Flexible Textile Reinforced Mortar Bandage / Innovative und denkmalgerechte Verstärkung des Aachener Doms mit einer flexiblen, textilbewehrten Rissbandage
A groundbreaking method for retrofitting historic structures using flexible textile-reinforced mortar bandages has been successfully applied to Aachen Cathedral. This innovative approach demonstrates significant potential for strengthening masonry while preserving its aesthetic and structural integrity. The study involved the application of a lightweight, flexible reinforcement system that effectively bridges cracks and enhances load-bearing capacity without altering the monument's visual character. By combining modern materials with traditional conservation techniques, this method offers a sustainable solution for the long-term preservation of cultural heritage sites facing structural deterioration.
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