Rome has elected Virginia Raggi as first female mayor in its 3000-year history.
Virginia Raggi is a 37 year old lawyer. She represents the 5-Star Movement.
“Today we need two things: honesty and courage,” Raggi tweeted, quoting 20th century socialist politician and former president Sandro Pertini.
The result is likely to pile pressure on Italian Prime Minister, Matteo Renzi, who faces a crucial referendum on constitutional reform in October on which he has staked his political career.
The prime minister has struggled to boost economic growth after years of stagnation and has been hurt by scandals in the banking sector.
M5S has capitalised on widespread frustration with traditional parties as the left and right have been tainted by corruption scandals.