In 2004, Arsenal's attempt to go 50 league matches unbeaten came to an abrupt end with defeat at Old Trafford. Eight years later, on the same day that Arsenal again crashed to defeat at the home of Manchester United, Italian champions Juventus lost their own 49-match unbeaten run in Serie A, with a 3-1 defeat at home to Inter.
To mark the Bianconeri's achievement, we've dusted down the record books to find out where their unbeaten run places them in the European football record books.
Below you'll find the top 10 unbeaten league runs in domestic leagues that have provided at least one European Cup winner* (much as we admire Barry Town's 51-game unbeaten run in 1997/98, we're not sure we can place it above Arsenal's achievement).
Romania's Steaua Bucharest are way out in front, although there is suspicion surrounding their incredible 104-game run. At the time, Romania was under the dictatorship of Nicolae Ceausescu, whose son Valentin was heavily involved with Steaua. It is alleged that Valentin Ceasescu used his influence to ensure Steaua secured the very best Romanian players, sometimes without the consent of the players themselves or the clubs they were leaving, including Georghe Hagi, who was one of the world's best players at the time. Valentin is also accused of influencing referee decisions and the performances of opposing teams, although, after the fall of the Ceausescu regime, he claimed only to have protected Steaua from the influence their rivals, Dinamo Bucharest, were able to exert as the favoured team of Romania's feared secret police.
The result of this rivalry was evident when, during Steaua's unbeaten league run, the two clubs met in the 1988 Romanian Cup final. With the game poised at 1-1, Steaua had a goal disallowed for offside in the 90th minute and their players walked off in protest at perceived bias toward Dinamo. The Romanian FA awarded the trophy to Dinamo, but after pressure from Valentin Ceausescu, it was subsequently handed to Steaua. After the collapse of Nicolae Ceausescu's regime, Steaua attempted to hand the trophy back to Dinamo, but their great rivals refused to accept the gesture.
While significant doubt surrounds Steaua's record unbeaten league run, the quality of their team was proved beyond the borders of Romania when they became the first Eastern European team to lift the European Cup, beating Barcelona in Spain in the 1986 final. Three years later they reached the final again, but this time were thrashed 4-0 in the Nou Camp, by one of the greatest club teams ever. It was AC Milan that beat Steaua that night and, three years later, the Italians would embark on probably the most impressive unbeaten league run in modern day football.
*Red Star Belgrade (51 games unbeaten, 1999-2001), Obilic (47 games unbeaten, 1997-1999) and Partizan Belgrade (45 games unbeaten, 1995-96) were excluded from this list on the basis that their unbeaten runs were achieved in the First League of FR Yugoslavia, a league formed after the break up of the old Yugoslavia in 1992, containing teams only from Serbia and Montenegro. It was in the old, pre-1992 Yugoslav First League - which contained notable clubs from Serbia, Croatia, Bosnia, Slovenia and Montenegro - that Red Star were playing when they won the 1991 European Cup.