1891 - Founded, on the 15th of February. The club starts as a gymnastic and athletics club.
1896 - AIK starts with football.
1899 - In the first derby against Djurgården AIK gets the win, 2-1. Same year the club reaches over 100 members.
1900 - AIK wins the Swedish league and the gold with 1-0 in the final against Örgryte.
1916 - AIK wins their fifth gold after beating Djurgården with 3-1 in the final.
1924 - The first "Allsvenskan" in football begins and AIK starts wins the opening game with 5-1 against Västerås IK and then 7-1 in the first Allsvenskan derby between AIK and Hammarby.
1932 - GOLD! AIK wins Allsvenskan for the first time.
1937 - AIK moves from Stockholms Stadion to newbuilded Råsunda Stadion.
1941 - AIK's first match in Svenska Cupen (the Swedish cup) ends in a victorie, 14-2 against Visby AIK.
1961 - AIK gets relegated from Allsvenskan for the second time.
1975 - A new attendance record when AIK plays Djurgården against 40669 spectators.
1976 - AIK wins Svenska Cupen for the third time.
1981 - Over 13000 members in the club.
1987 - AIK wins the Swedish indoorchampionship again.
1991 - AIK celebrates 100 years.
1992 - AIK wins the Allsvenskan again after 55 years.
1999 - AIK knocks out AEK Athens in the Champions League qualifications and gets to meet Barcelona, Arsenal and Fiorentina in the groupstage.
2004 - AIK gets relegated from Allsvenskan for the fourth time in the club's history after a terrible season.
Notice that I just picked important dates for the footballsection, besides the first one.