In Turkey and abroad, Recep Tayyip Erdogan has a polarizing effect. He has been described as a neo-Ottoman "sultan" as well as an authoritarian leader. From his early beginnings campaigning for Islamist causes to leading NATO's second largest military as the president of Turkey, DW explores the rise of the Turkish leader.

After years of moving up the ranks of the Islamist-rooted Welfare Party, Erdogan was elected mayor of Istanbul in 1994. But four years later, the party was ruled unconstitutional on the grounds it threatened Turkey's secularist nature, and was disbanded. He was later jailed for four months for a controversial public reading of a poem, and consequently lost his mayorship over the conviction.

Erdogan co-founded the Justice and Development Party (AKP), which won a majority of seats in 2002. He was made prime minister in 2003. During his first years in office, Erdogan worked on providing social services, improving the economy and implementing democratic reforms. But some have argued that his premiership was also marked by a religious shift in the political sphere.

While Turkey's constitution guarantees the country's secular nature, observers believe Erdogan has managed to purge the "old secularist guard." The Turkish leader has said that one of his goals is to raise a "pious generation." Erdogan's supporters have hailed the Turkish leader's initiatives, arguing that they've reversed years of discrimination against practicing Muslims.

In July 2016, a failed military coup targeting Erdogan and his government left more than 200 people dead, including civilians and soldiers. In the wake of the coup attempt, Erdogan declared a state of emergency and vowed to "clean up" the military. "In Turkey, armed forces are not governing the state or leading the state. They cannot," he said.

Since the failed coup, authorities have launched a nationwide crackdown, arresting more than 50,000 people in the armed forces, police, judiciary, schools and media. Erdogan has blamed Fethullah Gulen, a self-exiled cleric in the US and former ally, and his supporters of trying to undermine the government. But rights groups believe the allegations are a means to solidify his power and influence.

While Erdogan enjoys significant support in Turkey and the Turkish expatriate community, he has been criticized for his heavy-handed policies and military campaigns against Kurdish militants following the collapse of a peace process in 2015. This January, Erdogan launched a deadly offensive into the northern Syrian enclave of Afrin, an operation that was widely condemned by human rights groups.

Having served as Turkey's president since 2014, Erdogan successfully extended his time in office after winning elections in June. The elections marked Turkey's transition to an executive-style presidency. Observers believe the elections will herald a new era for Turkey – for better or worse.