Tunisia: December 17, 2010 - Mohamed Bouazizi, a 26-year-old vegetable cart vendor, sets himself on fire in protest after police confiscate his cart. He dies on January 4, 2011.
Late December 2010-Early January 2011 - Bouazizi's act of self-immolation sparks widespread protests.
January 14, 2011 - President Zine El-Abidine Ben Ali and his family flee to Saudi Arabia.
January 15, 2011 - Parliamentary speaker Fouad Mebazaa is sworn in as interim president until new elections are held.
January 17, 2011 - Prime Minister Mohamed Ghannouchi announces the new transitional coalition government.
February 26, 2011 - According to the Interior Ministry, three people are killed in clashes between demonstrators and security forces in Tunis. At least nine people are injured and more than 100 arrested, according to the state-run news agency, TAP.
February 27, 2011 - Prime Minister Mohamed Ghannouchi resigns. Tunisia's interim president selects Al-Baji Qa'ed Al-Sebsi as the country's new prime minister.
March 7, 2011 - Tunisia's Interior Ministry announces that it is dissolving its "political police" and the entire State Security Division, according to the country's news agency, Tunis Afrique Presse.
March 9, 2011 - A Tunisian court issues a ruling dissolving the Rally for Constitutional Democracy, the party of ousted President Zine El Abidine Ben Ali.
June 20, 2011 - After a one-day trial, former president Zine El Abidine Ben Ali is convicted of corruption in absentia.
October 23, 2011 - Tunisia holds the first free elections in the country's modern history to seat the new 217-member National Constituent Assembly.
Yemen: January 28, 2011 - Protests break out in Yemen.
February 2, 2011 - Yemeni President Ali Abdullah Saleh promises concessions, including not to seek re-election in 2013.
February 21, 2011 - Amid continued protests, Saleh refuses to step down, comparing the protests to a virus spreading through the region.
February 23, 2011 - State-run news service Saba reports that Yemeni President Ali Abdullah Saleh is calling for an end to the protests and says he supports the creation of a national unity government to oversee upcoming parliamentary elections.
February 25, 2011 - Amnesty International says at least 11 people died in the day's protests, bringing the overall death toll since protests began to 27.
February 26, 2011 - Medical officials say four people died and 26 were wounded following clashes that erupted at night between anti-government protesters and security forces in southern Yemen.
February 28, 2011 - Yemen's main opposition bloc rejects President Ali Abdullah Saleh's call to form a unity government to rule until elections to replace him.
March 4, 2011 - Security forces open fire on anti-government protesters in northern Yemen, killing two people and injuring nine others, witnesses say.
March 6, 2011 - Suspected al Qaeda militants kill four Yemeni soldiers. Also, in separate incidents, two officers in the Yemeni Political Security Organization, the country's intelligence agency, are assassinated. The Yemeni government says suspected al Qaeda forces are also behind the killing of the intelligence officers.
March 8, 2011 - Dozens of anti-government demonstrators are wounded when security forces fire into the air and shoot tear gas into a crowd of tens of thousands of protesters in front of Sanaa University, witnesses say. Eight protestors are in critical condition and one Yemeni man died from his injuries.
March 11. 2011 - Thousands of people demonstrate in Sanaa's Tahrir Square, demanding the departure of President Salih.
March 18, 2011 - 52 people are killed in a crackdown on protesters.
March 19-21, 2011 - Numerous Yemeni officials resign. They include the UN ambassador Abdullah al-Saidi and five other ambassadors.
March 20, 2011 - President Saleh dismisses his cabinet.