President Muhammadu Buhari has congratulated his Turkish counterpart, Recep Tayyip Erdogan on his re-election.
Delivering his speech outside the presidential palace in Ankara, and marking the introduction of a new, executive presidency with sweeping powers, Erdogan said the first meeting of his new cabinet would be held on Friday.
The new system abolishes the post of prime minister, granting the president the power to appoint the cabinet - which he was expected to announce later on Monday - and unelected vice-presidents. "With the power granted to us by the new presidential system, we will get quicker and stronger results".
Twenty-two heads of state and 28 prime ministers and speakers of parliament and scheduled to attend the ceremony.
Presidential aide Ibrahim Kalin said Erdogan would visit the mausoleum of Turkey's founder, Mustafa Kemal Ataturk, following the swearing-in ceremony. The opposition described Monday as the day when a partisan one-man regime officially starts ruling Turkey.
TRT World's Andrew Hopkins looks back at Erdogan's political career.
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He has also pledged to end the state of emergency that has been in place since the failed July 2016 coup and has seen the biggest purge in the history of modern Turkey.
Among 22 heads of state attending will be Venezuelan President Nicolas Maduro, regarded with disdain by Washington but an ally of Erdogan, and Ukrainian President Petro Poroshenko.
North Atlantic Treaty Organisation member Turkey's relations with its Western allies have been strained by disputes with the United States over military strategy in Syria and by European Union criticism of Ankara's large-scale purges of state institutions, armed forces, police and media following the failed coup.
The currency has been battered by concern about Erdogan's drive for lower interest rates and comments he made in May saying he planned to take greater control of the economy after the June 24 elections.
Inflation surged last month above 15 percent, its highest level in more than a decade, despite interest rate hikes of 500 basis points by the central bank since April. "We will take our country much further by solving [these] structural problems of our economy", he said. The lira has also fallen by a fifth in value against the dollar this year.