Turkish President Recep Tayyip Erdogan has been sworn in as head of state after winning an historic run-off election to extend his two-decade rule for another five years. “I, as president, swear upon my honour and integrity before the great Turkish nation and history to safeguard the existence and independence of the state … to abide by the constitution, the rule of law, democracy, the principles and reforms of Ataturk, and the principles of the secular republic,” Erdogan said in a ceremony at the parliament in Ankara, which was broadcast live on television on Saturday. Saturday’s inauguration in parliament will be followed by a lavish ceremony at the presidential palace in the capital Ankara attended by dozens of world leaders. Erdogan won the May 28 run-off against a powerful opposition coalition, and despite an economic crisis and severe criticism following a devastating February earthquake that killed more than 50,000 people. Erdogan won 52.2 percent of the vote while his rival Kemal Kilicdaroglu 47.8 percent, official results show. The 69-year-old leader will later in the day name his cabinet, which will be tasked with handling an economic crisis that has witnessed runaway inflation and the collapse of the lira.