Jose Mourinho has today signed a four-year deal with Chelsea which will see him make a return to Stamford Bridge and the Barclays Premier League.
Here, we look at the highs and lows of his three-year first spell at the Blues.
ARRIVING IN STYLE
Mourinho swept into Stamford Bridge in the summer of 2004, fresh from winning the Champions League with Porto, describing himself as the 'Special One'.
PREMIER LEAGUE SUCCESS
Mourinho guided Chelsea to their first league title in 50 years when two goals from Frank Lampard sealed the trophy with a 2-0 win at Bolton in April 2005
RETAINING THE TITLE
Chelsea successfully defended the Premier League title in 2006, with Mourinho celebrating by throwing his medal and jacket into the crowd in a typically flamboyant moment.
The first FA Cup final at the new Wembley Stadium in 2007 was won by Mourinho's Chelsea. It proved to be his last major success with the club.
Chelsea set a new record of 64 unbeaten home matches in the English top flight with an August 2007 win over Birmingham.
MARRED FIRST SUCCESS
Mourinho was sent off as he celebrated his side's equaliser in the Carling Cup final defeat of Liverpool by strolling down the touchline past opposition fans with his finger pressed to his lips in a silence gesture.
IT'S A DOG'S LIFE
Arrested and cautioned in May 2007 after allegedly refusing to allow police to quarantine his pet dog, a Yorkshire terrier called Leya. It did not have the correct documents.
GHOST GARCIA GOAL
In another duel with Liverpool, Chelsea lost in the Champions League semi-finals with a disputed goal from Luis Garcia. "It was a goal that came from the moon," said Mourinho, who never acknowledged the goal in the future.
Mourinho never hit it off with some Premier League managers, Arsene Wenger in particular. In October 2005, Mourinho taunted Wenger by calling him a "voyeur".
Mourinho accused referee Anders Frisk and Barcelona manager Frank Rijkaard of meeting during the half-time interval of their Champions League last-16 first leg in March 2005. Mourinho is labelled an "enemy of referees", receives a fine and a two-match ban; Frisk receives death threats and retires.
EGG ON FACE
Mourinho's tenure at Stamford Bridge ended when he criticised owner Roman Abramovich's failure to buy quality players to help his injury-hit squad. "No eggs, no omelette," Mourinho said. Days later he was gone.