St Andrew’s Day is celebrated each year on 30 November and is Scotland’s national day.
St Andrew is the patron saint of Scotland, as well as several other countries including Greece, Romania, Russia and Ukraine.
According to legend a monk called Regulus brought relics of St Andrew to Scotland where he was given land to build a church by a Pictish king. The settlement grew into the town of St Andrew’s, where the cathedral became a place of religious pilgrimage and the university, the oldest in Scotland, was founded in 1413.
The Scottish flag, the Saltire, is based on the X-shaped cross on which St Andrew was crucified on 30 November, 60 AD. An ancient story tells that a St Andrew’s Cross was seen in the sky on the morning of a crucial battle in 832AD between the Picts and the Angles. The Picts were inspired by the symbol and were victorious in the battle.
To read more and Source: http://www.educationscotland.gov.uk