thumb|Prothyrum of Lodi Cathedral A prothyrum (Romanization of Greek próthyron 'in front of the door'), in classical and medieval architecture, is a small porch, vestibule, or covered space immediately in front of the main doorway of a building. In architecture of the Greco-Roman world it was the transitional, often columned, space before the entrance proper. In the Late Antique and Byzantine periods, it could be a forecourt or portico preceding the narthex of a church or the main gateway of a monastic or palatial ensemble.
thumb|Prothyrum of Lodi Cathedral A prothyrum (Romanization of Greek próthyron 'in front of the door'), in classical and medieval architecture, is a small porch, vestibule, or covered space immediately in front of the main doorway of a building. In architecture of the Greco-Roman world it was the transitional, often columned, space before the entrance proper. In the Late Antique and Byzantine periods, it could be a forecourt or portico preceding the narthex of a church or the main gateway of a monastic or palatial ensemble.
== Etymology == The Greek noun (próthyron) literally means “the space before the door”. It can be spelled prothyron or the Latinized prothyrum in late Republican and Imperial texts.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).