Munster had won 14 on the trot, the last ten of the 2010-11 season and the first four of the next. From mid-February until the end of September that year, they swept all before them, including Leinster in the Grand Final at Thomond Park.
Nobody had ever put a run like that together before and nobody has done so since.
Leinster went close, winning twelve in a row between September 2011 and March 2012 only to lose that season's Final to the Ospreys. Ulster began the following season like a runaway train, careering through the entire first half of the campaign.
Despite eleven out of eleven, they, too, finished up losing the Final, to Leinster at the RDS. Now, for the first time, a non-Irish contender is into double figures for consecutive victories in the Guinness PRO2.
The Scarlets have beaten every opponent since mid-April, a sequence which began with a close shave against Zebre in Italy. A storming four-out-of- four finish last season hoisted them clear of Connacht and into the Champions' Cup which starts next week.
One point clear of Pat Lam's squad at the top after six straight wins, the West Walians put their flying start on the line in Dublin on Friday evening. Leinster at the RDS Arena has not exactly been the happiest of hunting grounds for the Scarlets.
The size of the challenge can be gauged from the fact that they have lost there in each of the four previous seasons. Their default position in Leinster's citadel has, more often than not, been behind the posts after conceding a try.
They have conceded 15 on their last three visits - six last season in losing 12-42, five the previous season (19-36) and four the season before that (5-32). Over that same period, the Newport Gwent Dragons alone of the Welsh regions have won in Dublin and to think the Ospreys won Finals there in 2010 and 2012.
The Scarlets will doubtless use those past results as grist to their motivational mill, a reminder that there could be no better time to start evening up the ledger than at the start of Round Seven on Friday.
Their second run-in with the former European champions comes three weeks after the first at Parc y Scarlets where DTH van der Merwe decorated his debut with two tries and flanker James Davies (Cubby), younger brother of Test centre Jonathan (Foxy), scored the other in a 25-14 win.
Should Leinster even up the score, they will pave the way for Connacht to go clear at the top, provided they they make it five straight home wins at the expense of Benetton Treviso, marooned to the bottom with nothing more uplifting than a quartet of losing bonus points.
The two teams immediately above them are both at home on Saturday afternoon, each in urgent need of improving on a start of one win out of six. Ospreys, forced to concede all five points to the Warriors in Glasgow last Sunday despite Dan Biggar's return from Rugby World Cup duty, meet Zebre at the Liberty Stadium.
The Blues, home again after five matches on the road because of their ground's use as a Rugby World Cup fanzone centre, reacquaint themselves with the BT Sport Arms Park for the visit of the champions.
The Warriors did the double over Wales' capital region last season en route to the title, winning home and away in some style by a combined margin of 69-29. They scored three tries at the BT Sport Arms Park in the second week of the season and five more, including a Peter Horne hat-trick, last April.
Munster, up to third on the strength of winning the first of the all-Irish, inter-provincial affairs against Ulster in Limerick last week, reappear on Saturday against Edinburgh at BT Murrayfield - by coincidence the fixture which put a stop to their record-breaking run four years ago.
Of Munster's Grand Final winning XV that season, only three are still there - Conor Murray, Keith Earls and Donnacha Ryan. The rest have either retired or moved to pastures new.
Ulster, without a win on the road since Connacht in Galway towards the end of last season, try again at Rodney Parade where the Dragons have beaten them on each of their last two visits, most notably last March when Carl Meyer produced the decisive score.
His expert finish in the corner proved just enough to trump Craig Gilroy's double for Ulster and ensure the Dragons a famous victory. Head coach Lyn Jones will settle for nothing less than a repeat performance on Sunday.
For the record:
Scarlets' ten-out-of-ten: (April 2015 - )
Zebre (a) Won 28-26
Dragons (a) Won 29-10
Cardiff Blues (h) Won 16-6
Treviso (a) Won 17-13
Warriors (a) Won 16-10
Ulster (h) Won 22-12
Zebre (a) Won 20-8
Leinster (h) Won 25-14
Munster (h) Won 25-22
Dragons (h) Won 25-12
Munster's record 14 straight wins: (February - September 2011)
Edinburgh (h) Won 23-13
Aironi (a) Won 20-10
Dragons (h) Won 38-17
Cardiff Blues (a) Won 16-15
Leinster (h) Won 24-23
Scarlets (a) Won 13-6
Ospreys (a) Won 22-20
Connacht (h) Won 22-6
Ospreys (h) Won 18-11
Leinster (h) Won 19-9 (Grand Final)
Dragons (h) Won 20-12
Warriors (a) Won 23-12
Scarlets (h) Won 35-12
Cardiff Blues (a) Won 18-13
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