May Day 2016: How did the holiday come about?
Ancient Egyptians held first May Day celebrations, but most British customs have Celtic roots
Throughout Europe, 1 May has traditionally been marked with celebrations of springtime fertility and the arrival of warmer weather.
Despite attempts by Church authorities to refashion May Day into a religious holiday, the pagan roots of the festival remain unusually close to the surface.
The earliest spring festival on record, now called Sham El-Nessim, was held in ancient Egypt and is still observed today.
In ancient Rome, the start of May was celebrated for the arrival of longer days and the start of the farming season. People would dance, gather flowers and, according to some sources, set aside their white togas in favour of brighter wares.
In the British Isles, most May Day traditions derive from Anglo-Saxon and Celtic traditions, particularly the Gaelic festival of Beltane, which means "the return of the sun".
Fires were lit and people and animals walked (or danced) between the flames in a ceremony to promote purification and fertility. Some believe this is where maypole dancing has its origins.
Many pagan festivals lost their character in the Middle Ages, as they were suppressed or appropriated by Christianity. In Catholic Britain, the month was associated with the Virgin Mary and on May Day, effigies of the Virgin Mary were crowned with flowers. Electing a May Queen remains commonplace in many parts of Europe and the US.
Dancing around the Maypole: This continues to be one of the most popular May Day customs in the UK, despite having originated in southern Europe. Participants dance around a wooden pole, holding colourful ribbons that become decoratively intertwined before they reverse their steps and cause the ribbons to unwind. This is said to symbolize the lengthening of the days as summer begins.
Morris Dancing: Named after 13th-century Moorish or "Moresco" dancers, Morris dancers are a stalwart of the celebrations. The stomping of feet and clashing of sticks represents the battle between good and evil and the triumph of summer over winter.
Modern interpretations: May Day is also known by Catholics as the alternative Feast of St Joseph, alongside his traditional day on 19 March. The 1 May celebrations places particular importance on Joseph's status as the patron saint of workers. As such, International Workers' Day is also celebrated on 1 May, as is the US's Labor Day.
Public holiday: Although May Day itself is not a bank holiday, the first Monday in May was established as a holiday in 1978. In 2011, parliament considered introducing a replacement that would fall in October but abandoned the plans, thankfully (unless you're reading this in October).