Turkish leader Recep Tayyip has taken the oath of office, ushering in a third presidential term following three stints as prime minister.
Mr Erdogan, 69, won a new five-year term in a run-off presidential race last week, potentially stretching his 20-year rule in the key country that straddles Europe and into a quarter of a century.
He took the oath in a session in parliament before an inauguration ceremony to be attended by dozens of foreign dignitaries.
The Turkish leader will announce his new cabinet later today.
The line-up should indicate whether there will be a continuation of unorthodox economic policies or a return to more conventional ones amid a cost-of-living crisis.
Turkish President Tayyip Erdogan, accompanied by his wife Emine Erdogan, greets participants during his inauguration ceremony at the Presidential Palace in Ankara
Turkish Vice President Fuat Oktay (second from left) and Azerbaijani President Ilham Aliyev (second from right) attend Erdogan's inauguration ceremony 
The country of 85 million controls Nato's second-largest army, hosts millions of refugees and played a crucial role in brokering a deal that allowed the shipment of Ukraine grain, educate averting a global food crisis.