An Ontology for Legacy Data on Ancient Ceramics of the Plain of Catania ⋆ Rodolfo Brancato 1 , Marianna Nicolosi-Asmundo 2 , Grazia Pagano 2 , Daniele Francesco Santamaria 2 , and Salvatore Ucchino 2 1 Department of Human Sciences, University of Catania email: rodolfobrancato@gmail.com 2 Department of Mathematics and Computer Science, University of Catania email: {nicolosi,santamaria}@dmi.unict.it, {grazia.pagano89,turirg}@gmail.com Abstract. Digital representation and organization of legacy data plays a crucial role in the diffusion, use, and understanding of data stored in old publications, archives, and museums. An interesting case study comes from data of potteries discovered in ancient rural territories of Eastern Sicily, as the majority of legacy data for this research area exists in the form of old maps and paper catalogues: to make these datasets available at a global level, innovative digital technologies are needed. The Semantic Web offers well established methodologies and tools to semantically model application domains and to integrate data, making them global entities available on the Web. In this contribution, we present OntoCeramic 2.0, an OWL 2 (Web On- tology Language 2) ontology storing archaeological data from the plain of Catania regarding ancient potteries, and whose taxonomy refines and extends OntoCeramic 1.0, an ontology for the classification of ancient ce- ramics defined in a previous work by some of the authors. OntoCeramic 2.0, constructed according to the standard CIDOC Conceptual Reference Model (CRM), represents and integrates new survey and legacy data on ancient pottery stored in the archives of Heritage Superintendence of Syracuse and Catania, in the Regional Technical Office of Sicily, and in the State Archives of Palermo and Catania. 1 Introduction Archaeological studies carried out in Sicily for over a century report on forgotten cities, necropolises, monuments, artefact scatters, and other landscape features. Resulting data are still limited in quantity and variable in quality: this prob- lem is particularly prevalent in the countryside. Because of that, legacy data nowadays available for the plain of Catania (Sicily) are of basilar importance for archaeologists. This holds, in particular, if such data are represented and organized in a digital way, globally accessible on-line, and easily verifiable. ⋆ We gratefully acknowledge support by “Universit` a degli Studi di Catania, Piano della ricerca 2016/2018 Linea di intervento 2”.