Following is a chronology of the events which unfolded during the political crisis in Perak after the 12th general election on March 8, 2008, leading up to today's ruling by the Federal Court on who is the rightful menteri besar of Perak -- Datuk Seri Dr Zambry Abdul Kadir of the Barisan Nasional (BN) or his predecessor Datuk Seri Mohammad Nizar Jamaluddin of PAS of the DAP-PKR-PAS pact.
March 17 2008: - Mohammad Nizar, the state assemblyman for Pasir Panjang, is sworn is as the menteri besar of Perak.
Feb 1 2009: - Perak State Assembly Speaker V. Sivakumar announces he has received the resignation letters of Behrang assemblyman Jamaluddin Mat Radzi and Changkat Jering assemblyman Mohd Osman Jailu. Both assemblymen deny they have resigned.
Feb 3 2009: - Election Commission (EC) decides Behrang and Changkat Jering seats are not vacated and as such, by-elections are not required for the constituencies.
Feb 4 2009: - Deputy Prime Minister Datuk Seri Najib Tun Razak announces that the Perak BN has a simple majority to set up the state government after two PKR assemblymen and one DAP assemblyman quit their parties and become independent assemblyman friendly to the BN.
Perak BN and Pakatan Rakyat both have 28 seats each in the state assembly while three assemblymen are independents.
Feb 5 2009: - A media statement issued by the office of the Sultan of Perak states that the sultan will not dissolve the state assembly and has asked Mohammad Nizar and the state executive council to resign or their positions will be deemed to have become vacant.
Feb 6 2009: - Dr Zambry is appointed as the 11th menteri besar of Perak, replacing Mohammad Nizar.
BN officially takes over the administration of the Perak government.
Feb 13 2009: - Mohammad Nizar initiates legal action, seeking a court declaration that he is still the rightful menteri besar and an injunction prohibiting Dr Zambry from discharging his duties as the menteri besar.
March 6 2009: - High Court Judge Lau Bee Lan refers to the Federal Court for determination of constitutional issues in the summons filed by Mohammad Nizar challenging the validity of the appointment of Dr Zambry as the menteri besar of Perak.
March 23 2009: - Federal Court decides that the Mohammad Nizar vs Dr Zambry case be sent back to the High Court.
April 3 2009: - Mohammad Nizar is given the "green light" by the Kuala Lumpur High Court to challenge the validity of appointment of Dr Zambry as the Perak menteri besar following a ruling by Justice Abdul Aziz Abdul Rahim that the application filed by Mohammad Nizar in February was not frivolous or vexatious and that there was a prima facie case to be argued in court.
May 11 2009: - High Court declares Mohammad Nizar as the rightful menteri besar of Perak after finding that he had never vacated his post as he had not lost the confidence of the majority of the state assemblymen.
May 12 2009: - Dr Zambry remains as menteri besar until the Court of Appeal hears his appeal against the High Court decision declaring Mohammad Nizar as the right menteri besar following Court of Appeal Judge Datuk Ramly Ali's decision allowing Dr Zambry's application to stay the execution of the High Court ruling.
May 22 2009: - The decision of the High Court is dismissed by the Court of Appeal which declares Dr Zambry as the rightful menteri besar in accordance with the constitution.
June 19 2009: - Mohammad Nizar files leave application to Federal Court to challenge Court of Appeal decision.
Nov 5 2009: - Five-man bench of Federal Court adjourns decision to Feb 9, 2010 after hearing submissions.
Feb 9 2010: - The five-member panel of the Federal Court led by Court of Appeal president Tan Sri Alauddin Mohd Sheriff unanimously ruled that the Sultan of Perak, Sultan Azlan Shah, had exercised his royal power to appoint Zambry to replace Datuk Seri Mohammad Nizar Jamaluddin from the DAP-PAS-PKR coalition after he was satisfied that the Mohammad Nizar had lost the majority vote of the state legislative assembly.