“Nigerians held him in the highest esteem even when he was out of office until his demise and will forever miss his wise counsels,” the president added in his statement.

Shagari, a Fulani Muslim from Nigeria’s northwest, became the country’s first executive president with full, rather than ceremonial, powers when the country introduced a US-style system in 1979.

Under his rule, the state of the economy deteriorated as oil prices fell in the early 1980s, mismanagement increased and debt piled up.

Despite these woes, Shagari won what was described by his party as a “landslide victory” in 1983. But the vote was bitterly contested by the opposition, with allegations of electoral fraud.

On December 31 that year, Buhari toppled the government and Shagari was arrested with many of his ministers and notable party members on corruption charges.

After a series of military-backed trials, the deposed leader was cleared of graft allegations.

Since leaving politics, Shagari largely retired from the public eye.