This article argues that, based on a close reading of the ancient textual, documentary and epigraphic evidence, the expression ὁ μικρός in Mark 15.40 is most likely a nickname regarding this James’ particular height or potentially an affectionate indication that he is a child. The expression ὁ μικρός is not an indication of comparative age to another person (‘younger’). The evidence from ancient epigraphy and the LXX, initially provided by Adolf Deissmann to support a longstanding reading of ὁ μικρός as ‘the younger’ in Mark 15.40, proves to be less than reliable.