One of Jesus Christ's twelve disciples and patron saint of Scotland.
In Scotland, there is a town named after him, and a Saint's day celebrated by eating a meal of haggis neeps and tatties
St. Andrew died by crucifiction, but did not wish to sully the cross that his messiah was executed upon, and so had himself crucified on an 'X'-shaped cross, rather than the usual upright cross.
Consequently, the national flag of Scotland, the Saltire, is a Cross of St. Andrew, white, on an azure (or sky-blue) background.