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These excavations permitted to ascertain that the martyr Valentine was not buried into the catacomb, but directly into a pit outside it; on this subdial grave Pope Jiulius I (336–352) built a former basilical structure, which was modified and enlarged by popes Honorius I (625–638) and Theodore I (642–649) and further restored in the following centuries until the last works carried out by Pope Nicholas II in mid-11th century.