2002 – Makes debut for Sporting Lisbon in the Portuguese Super Liga at the age of 17 after winning international caps for Portugal's youth sides.
2003 6 August – Scores in pre-season friendly against Manchester United.
8 August – Completes £12.24m transfer to United, taking the No7 shirt following the sale of then England captain David Beckham to Real Madrid.
16 August – Makes debut as a second-half substitute in opening-day 4–0 win over Bolton at Old Trafford.
20 August – Plays for Portugal's full side in 1–0 win over Kazakhstan.
1 November – Scores first goal for United in 3–0 victory over Portsmouth at Old Trafford.
2004 22 May – Dazzles in United's 3–0 FA Cup final victory over Millwall.
24 June – Scores in penalty shoot-out as Portugal knock England out of Euro 2004.
4 July – Plays in Euro 2004 final, which Portugal lose 1–0 to Greece.
2005 19 October – arrested and questioned by police after an allegation of rape at a London hotel is made against him. Ronaldo asserts his innocence. No charges are brought.
18 November – agrees two-year extension to his United contract, keeping him at the club until 2010.
2006 1 July – Protests to referee Horacio Elizondo after United team-mate Wayne Rooney clashes with Ricardo Carvalho in the World Cup quarter-final between Portugal and England. Rooney is sent off and television pictures catch Ronaldo winking towards the bench. Scores the winning penalty in the shoot-out to knock out England.
8 July – After losing the third-place play-off to Germany, Ronaldo reveals he wants to leave United. Admits he would like a move to Spain, having been linked with Real Madrid.
2007 6 February – named Portugal captain for friendly against Brazil a day after 22nd birthday.
13 April – Agrees new five-year deal with United.
22 April – Voted PFA Player and Young Player of the Year – the first player to land the double award since Andy Gray in 1977.
4 May – Voted Footballer of the Year by the Football Writers' Association as United win the Premier League title.
2008 19 March – scores twice in a 2–0 win over Bolton to take his tally for the 2007-08 season to 33, beating George Best's 40-year-old club record for goals scored by a winger in a single season.
27 April – Voted PFA Player of the Year for second year running.
5 May – Helps United claim Premier League title with win at Wigan.
21 May – Heads United in front in Champions League final against Chelsea in Moscow. The game goes to penalties and, despite Ronaldo missing his kick, United win the shoot-out. Ends the season with 42 goals.
22 May – Real Madrid coach Bernd Schuster says he believes Ronaldo will play for the Spanish club at some point in his career.
2 June – Ronaldo is reported to have told Brazilian website Terra that he wants to join Madrid, if they can meet United's asking price.
6 June – United report Madrid to Fifa over their pursuit of Ronaldo.
19 June – Winger is unable to prevent Portugal exiting Euro 2008 as Luiz Felipe Scolari's team lose 3–2 to Germany in the quarter-finals.
8 August – Tells Portuguese newspaper Publico he will remain with Manchester United "for at least another year".
17 August – Makes return from injury as a 62nd-minute substitute in a home draw with Villarreal in the Champions League.
15 November – scores 100th goal for Manchester United with the first of a brace against Stoke.
2 December – Wins the Ballon d'Or, seeing off competition from second-placed Messi and Liverpool's Fernando Torres in third.
2009 8 January – Escapes uninjured after writing off Ferrari by crashing into a roadside barrier under a tunnel near Manchester Airport on his way to training.
12 January – Named Fifa World Player of the Year.
16 May – Helps United win Premier League title with 0–0 draw against Arsenal.
27 May – Unable to prevent United losing 2–0 to Barcelona in the Champions League final in Rome.
11 June – United accept a world-record £80m bid for Ronaldo from Real Madrid.
credits to : www.man-united-news.blogspot.com