Historical clue formulations

• Infamous denier of Mary and Joseph — 2025-05-24
• Accommodating person? ... or a hint to 20-, 28-, 48- and 57-Across — 2011-11-09
• One at the front desk, perhaps — 2009-01-28
• Harry Bailly, in "The Canterbury Tales" — 2006-08-13
• Key distributor — 2005-10-22