ante diem v idus januarias

Agonalia -- one of four dies agonales during which the Rex Sacrorum would sacrifice a ram in the Regia; on this occasion apparently in honour of Janus.
250 A.D. -- martyrdom of Felix and companions in Africa
302 A.D. -- martyrdom of Julian and companions at Antioch
c. 303 A.D. -- martyrdom of Marciana at Caesarea (Mauretania)