**Arsenal’s Invincibles, Edwin Moses’ 122 consecutive 400m hurdles race victories and Esther Vergeer’s 470 match winning streak in wheelchair tennis.** \nThese are just some of the remarkable unbeaten runs in sport which have forged their way into the history books. \n\nWe may well, in time, come to add Leinster’s mammoth feat to that list should it continue to go on and on through this most unique of seasons. \n\nAs it stands right now, Leo Cullen’s winning machine is at 21 matches unbeaten in a run which stretches all the way back to their semi-final triumph over Munster in last season’s Guinness PRO14 Final Series on 18 May 2019. \n\nNow, 462 days later and defending the PRO14 title they won last year, Leinster face the same opponents as they restart their quest to keep creating history. \n\nCullen may not like to admit it himself, with his sights more focused on picking up further trophies both in the PRO14 and in Europe, but the unbeaten run has already been an outstanding achievement. \n\nThere have been 13 wins on the bounce in the PRO14 this campaign, amounting to an 18-point lead at the top of Conference A, and six in Europe.