The whole ting started when 15th seuntry started in biritain. Then St Patricks where 16 years old, he where kiddnapped. And he made to escape. Then he became a preast and adopted the christian navn Patrick.
St Patrick's day is the Irish national day and it celebrates 17 march.
The Irish observed this day as a religioud holiday for over a thousand years, they started to celebrate it because it was that day St Patrick died.