First government of José Luis Rodríguez Zapatero
The first government of José Luis Rodríguez Zapatero was formed on 18 April 2004, following the latter's election as prime minister of Spain by the Congress of Deputies on 16 April and his swearing-in on 17 April, as a result of the Spanish Socialist Workers' Party (PSOE) emerging as the largest parliamentary force at the 2004 Spanish general election. It succeeded the second Aznar government and was the government of Spain from 18 April 2004 to 14 April 2008, a total of 1,457 days, or 3 years, 11 months and 27 days.
Source: Wikipedia — First government of José Luis Rodríguez Zapatero (CC BY-SA 4.0)