Petro, who has vowed social and economic change to heal the nation's historic divisions, as well as a set of strong policies to tackle the climate crisis, won Colombia's presidency on Sunday, the first left-wing candidate to do so in the country's history.
With nearly all votes counted, Petro holds an insurmountable 700,000+ vote lead over the right-wing candidate, Rodolfo Hernandez.
Francia Marquez, Petro's running mate, becomes country's first Afro-Colombian woman vice president.
During the first round of the presidential election, Peace & Justice Project founder Jeremy Corbyn visited Bogota as an election observer with Progressive International.
Petro's incredible victory is the latest in recent left-wing resurgences around the world, from victories in Peru and Chile, to Jean-Luc Mélenchon's NUPES coalition depriving the French president Emmanuel Macron of a parliamentary majority.