Pep Guardiola has scaled the Everest of club football once again.
Manchester City's win over Inter Milan in Saturday night's Champions League final wrapped up a historic Treble triumph with Europe's premier prize added to the Premier League and FA Cup.
But for City's boss, it isn't even the first time one of his teams has dominated a season in such a way.
His first season as Barcelona's first-team coach - 2008-09 - saw them claim the LaLiga title, Copa del Rey and the Champions League, where they defeated reigning champions Manchester United in the final.
Two seasons later, in 2010-11, they came within a whisker of a repeat, winning LaLiga and again beating United in the Champions League final.
But Cristiano Ronaldo's goal for Jose Mourinho's Real Madrid in the Copa del Rey final was the only thing that prevented a repeat.
Guardiola's Barcelona of that era are considered one of the most aesthetically-pleasing football teams of all-time.
Their 'tiki-taka' philosophy was revered by everyone apart from their opponents and fans gasped at the wonder of Lionel Messi, the intricacy of Xavi and Andres Iniesta, and, in 2009 at least, the attacking input of Thierry Henry and Samuel Eto'o.
So how do City's champions compare to their manager's finest Barca teams from just over a decade ago?
WHO THEY BEAT
After just one season coaching Barcelona's B team, president Joan Laporta promoted club legend Guardiola to the top job in the summer of 2008.
What followed was beyond anyone's wildest expectations as they dominated everyone they encountered.
Barca finished nine points clear of Real Madrid in the Spanish title race, racking up 105 goals and ending up with an absurd goal difference of +70.
Things reached a crescendo when they whipped Real 6-2 in the Bernabeu in early May with Henry and Messi both scoring twice. They could even afford to slacken off in their final few games.
They added the Copa del Rey by beating Athletic Bilbao 4-1, while highlights in the Champions League included a 4-0 rout of Bayern Munich in the quarter-final, first leg.
Guardiola was actually sent to the stands by English referee Howard Webb in that game for a vociferous protest when Messi was denied a penalty early on and booked for diving.
In the semi-final, they were seconds away from a heart-breaking exit to Chelsea following the untimely dismissal of Eric Abidal at Stamford Bridge.
That was until Iniesta scored the decisive away goal deep into injury time and prompted a jubilant Guardiola dash down the touchline.
In the Rome final, they were superior to Sir Alex Ferguson's strong Man United side, goals by Eto'o and Messi completing the first Treble in Spanish football history.
The following season saw them win another league title - by a much closer margin of only three points from Real Madrid despite them losing just once all season - but they fell short in Europe, losing to Mourinho's Inter Milan in the semi-finals.
But they'd conquer the Champions League once more in 2011, having overcome Real in a bad-tempered semi-final, they once again put United in a spin in the final at Wembley.
Pedro, Messi and David Villa all scored to secure Barca their third European title in six years.
This season's City team have been just as impressive as those Barcelona sides in terms of results.
Even though they trailed Arsenal in the Premier League title race for much of the season, once City hit their stride after the turn of the year they resembled an unstoppable express train.
City did not lose between February 5 and May 28, when on the final day they lost at Brentford with upcoming finals on their mind.
They amassed 89 points to finish five ahead of the Gunners, whom they beat 4-1 at home and 3-1 away, to win a fifth title in six seasons.
They eliminated both Chelsea and Arsenal from the FA Cup, then were clearly superior to United in last weekend's final.
But some of their most swashbuckling performances were reserved for the Champions League, where City have finally cracked it after 12 years of striving.
Erling Haaland netted five times in their 7-0 last-16 demolition of RB Leipzig, before Bayern were brushed aside 4-1 on aggregate in the last eight.
City's 4-0 defeat of reigning champions Real Madrid in the semi-final, second leg, however, must rank among the finest European performances by an English club ever.
They completed the job thanks to Rodri's second-half winner against Inter Milan on Saturday night.
STYLE OF FOOTBALL
Guardiola's Barcelona are fondly remembered for their thrilling brand of football, which became popularly known as 'tiki-taka'.
There was an obsession with possession and, if the opposition dared to have the ball, of getting it back off them within a matter of seconds (six seconds ideally) through aggressive pressing.
Xavi and Iniesta, of course, were central to this control of the ball in midfield with Alex Ferguson once describing it as 'like being on a carousel and feeling dizzy.'
Guardiola came to hate the term 'tiki-taka' and possession for the sake of possession without direction.
But back then, the premise was to overload an opponent on one side of the pitch to create space to exploit elsewhere.
Messi was, of course, masterful at this. Initially deployed on the right-hand side when Eto'o and Henry were in the team, he was shifted more centrally into a false nine role and excelled even more.
Another aspect was full-backs, especially Dani Alves, being encouraged to push forwards to support the attackers at every opportunity.
Much of Guardiola's ethos has remained the same down the years. City still seek to dominate the ball and drain opponents from constant chasing around.
Pressing has become more commonplace in the game but Guardiola has counteracted this by asking his keeper Ederson to loft longer passes to team-mates in space in midfield.
He seldom stands still tactically and one notable evolution this season was moving defender John Stones into midfield, where he has excelled.
Now as back then, Guardiola remains an outstanding man manager. It's unusual a player does not improve their game after working with him. Jack Grealish, burdened with a £100million price tag, has improved immeasurably this season to last.
He knows how to coax the best out of his stars, too. Kevin De Bruyne was the target of his criticism for not getting the fundamentals right earlier in the year. Chastened, he responded with a devastating run of form.
City boast an enviable depth in squad quality, which eases the strains of a hectic schedule. With players cycling in and out of top form, everyone plays their part at some points in the campaign.
STRONGEST XI
As soon as Guardiola sat in the Barcelona hotseat, the club sold popular figures Ronaldinho and Deco to AC Milan and Chelsea respectively at his request.
Eto'o was expected to leave too but didn't, while Guardiola shaped the side in his image with the signings of Alves, Seydou Keita and Gerard Pique. Pedro and Sergio Busquets were notably named promoted into his first-team squad.
Guardiola drilled into everyone the enterprising way he wanted to play and it all clicked in spectacular style.
With Victor Valdes in goal, his usual back line in 2008-09 would see Alves at right-back and Eric Abidal at left-back, with two of Rafael Marquez, Pique or Carles Puyol in the centre.
The midfield of Xavi, Iniesta and Busquets pretty much picked itself, though Barca also had Yaya Toure and Keita to call upon.
Up front, the free-scoring trio of Messi, Eto'o and Henry (they found the net exactly 100 times between them that season) would trouble any opposition defence.
By 2011, Toure, Eto'o and Marquez had moved on, a season-long experiment with Zlatan Ibrahimovic fell flat, and Pedro, David Villa and Javier Mascherano were prominent.
However, the core of Valdes, Pique, Busquets, Xavi, Iniesta and Messi were still propelling them forwards, fully equipped for Guardiola's demands as they were.
The City team Guardiola has had at his disposal this season would undoubtedly give his best Barcelona side a good game.
It's a formidable side that has been gradually built up and strengthened over the course of five years until everyone involved is fully comfortable with the desired style of play.
Evolutions this season have been the addition of Haaland up front after Guardiola quite often played without a recognised centre forward. His record-breaking goal tally has clearly taken them to a whole new level.
Behind and either side of him, Jack Grealish, Gundogan, De Bruyne and Bernardo Silva all supply plenty of ammunition. Phil Foden, Riyad Mahrez and Julian Alvarez aren't shabby alternatives.
John Stones has stepped forward into midfield this season alongside Rodri in another Pep tweak and has looked comfortable doing so.
In their back three, City have plenty of choice - Kyle Walker, Ruben Dias, Manuel Akanji, Nathan Ake and Aymeric Laporte - all can be interchanged without any loss of strength.
Ederson, with his ball-playing abilities, is the perfect goalkeeper for Guardiola.
Both the Barca and City sides are jam-packed with world class talent, ooze creativity and score tons of goals. You'd struggle to split them.
MONEY SPENT
There's no denying that City's Abu Dhabi owners have spent enormous sums of money - over £1billion - to get to this point. Each summer, the team has been built up a little more at lavish expense.
Not many pre-date Guardiola's arrival in 2016 but City have been adept in getting their transfer business done with the minimum of fuss.
Working backwards from last summer, expensive purchases include £51m Haaland, £100m Grealish, £61m Ruben Dias, £62m Rodri, £60m Riyad Mahrez, £57m Aymeric Laporte, £50m Kyle Walker, £43m Bernardo Silva and £50m John Stones.
Phil Foden aside they don't have regulars that have come through their academy, meaning a reliance on big money signings.
But they have also raised plenty of money through sales to balance the books. Ahead of 2022-23, they sold Raheem Sterling to Chelsea for £50m plus Gabriel Jesus and Oleksandr Zinchenko to Arsenal for a combined £75m.
It brings City's net spend since Guardiola arrived closer to the £480m mark.
The La Masia core of Messi, Xavi, Iniesta, Busquets, Puyol, Pique (via Man United), Pedro and Valdes meant Guardiola's Barcelona's team is inevitably less expensively assembled than City's.
Barcelona invested plenty of time and effort into these gifted players, but paid no transfer fees. Other members of the side were quite expensive for the standards of the time.
Dani Alves cost €32.5m, the third-highest transfer fee for a defender at the time. Henry cost €24m to bring in from Arsenal, while Toure and Keita were both around the €15m mark. Eto'o had cost them €27m from Real Mallorca in 2004.
Let's not forget there were some expensive failures too, such as Ibrahimovic, who cost £59m plus Eto'o in 2009, but fell out with Guardiola and played only the 2009-10 season at the Nou Camp.
Ahead of the 2010-11 season, the signings of Villa and Mascherano cost them a combined €60m.
So while Barca wasn't a billion pound team, they did need big value players by the standards of the time to supplement their homegrown nucleus.