Named Entity Recognition (NER) is a fundamental Natural Language Processing (NLP) task that aims to identify and classify entity mentions in texts across different categories. While languages such as English possess a large number of high-quality resources for this task, Brazilian Portuguese still lacks in quantity of gold-standard NER datasets, especially when considering specific domains. Particularly, this paper considers the importance of NER for analyzing historical texts in the context of digital humanities. To address this gap, this work outlines the construction of MariNER: \textit{Mapeamento e Anota\c{c}\~oes de Registros hIst\'oricos para NER} (Mapping and Annotation of Historical Records for NER), the first gold-standard dataset for early 20th-century Brazilian Portuguese, with more than 9,000 manually annotated sentences. We also assess and compare the performance of state-of-the-art NER models for the dataset.
@article{arxiv.2506.23051,
title = {MariNER: A Dataset for Historical Brazilian Portuguese Named Entity Recognition},
author = {João Lucas Luz Lima Sarcinelli and Marina Lages Gonçalves Teixeira and Jade Bortot de Paiva and Diego Furtado Silva},
journal= {arXiv preprint arXiv:2506.23051},
year = {2025}
}