If you'd have asked about Col Michael Randrianirina on the island of Madagascar before last weekend, you'd have got a lot of blank looks.

In just three days, however, he has become arguably the most powerful person in country.

Randrianirina's sudden ascent began on Saturday, when as the head of Madagascar's elite CAPSAT army unit, he drove with his troops into the centre of the capital city, joining thousands of protesters who had long been demanding the president's resignation.

After Andry Rajoelina eventually fled the city and MPs voted to impeach him, 51-year-old Randrianirina stood in front of the vacant presidential palace and informed the world's media that CAPSAT was taking over.

The constitutional court then declared that he was the country's new ruler, even though the ousted president still insists that he remains in charge.