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Margrethe is abdicating 52 years on the day after she ascended the throne following the death of her father, King Frederik IX.

Queen Margrethe was 31 when she ascended the Danish throne on Jan. 14, 1972, just hours after her father, King Frederik IX, died following complications from a lung infection.

When she ascended the throne in 1972 after her late father, King Frederik IX, only 42% of Danes supported the monarchy.

Less than a month after Queen Margrethe took over the throne in 1972 following the death of King Frederik IX, a girl called Mary Donaldson was born on the other side of the world in a small Hobart hospital.

Queen Margrethe II is the world's only reigning queen and the longest serving current monarch in Europe, taking the throne after the death of her father King Frederik IX in 1972.